context: In a crowded nightclub, a well-known drug pusher is enjoying an evening out with several female companions. One of his junkie henchmen approaches him and tells him that he's driving the pusher's car, and he's brought him a young woman who is willing to do
  anything to get some drugs. The pusher is angry until
  he sees the person in the car, a beautiful woman who
  returns with him to a shabby apartment. Just when it
  seems like they are going to have sex, the woman pulls
  a severely sawed-off shotgun out of her macrame purse
  and blasts the dealer's head off. The henchman, who
  is in the other room shooting up, is confronted by the
  woman, who tells him her last name is Coffin, and that
  her sister is LuBelle Coffin. LuBelle is now in a
  hospital, having shot up with tainted heroin, and her
  mind is permanently damaged. The enraged woman forces
  the man to take another hit of heroin, which kills
  him.The woman is known to her friends and associates as
  Coffy (Pam Grier), a nurse at a city hospital. Coffy has a romance with political hopeful Howard Brunswick (Booker Bradshaw), but she is devoted to caring for her sister. She gets news of her "hit" from Carter (William Elliott), a policeman friend of hers. Carter is a good cop who refuses to take payoffs from local mobster Arturo Vitroni (Allan Arbus), and as a result, Vitroni sends his henchmen to knock Carter around. Coffy happens to be in the way at the time, and both of them wind up in the hospital. Coffy is little more than shaken, but Carter is beaten unconscious and seriously injured.More angry than ever, Coffy sets out to stop the mobsters once and for all. She learns of a pusher named King George (Robert DoQui) who is supplying heroin to local dealers. George is also a well-known pimp; Coffy is vaguely familiar with George because one of his prostitutes, Priscilla (Carol Locatell), once came to Coffy's hospital after George cut her face. Coffy visits Priscilla at her home and leans on her for information about George and his business practices. Priscilla tells Coffy about Arturo Vitroni and how he is one of George's best clients. Vitroni apparently likes to treat his hookers cruelly, humiliating them and making them do degrading things for his pleasure. Priscilla balks when Coffy asks her where George keeps his stash; she is afraid that if she tells Coffy this, George will find out and kill her, so she pulls a knife on Coffy and tries to frighten her off. Instead, Coffy turns violent, shattering a wine bottle and threatening Priscilla with the jagged edge. Priscilla tells Coffy that George keeps his heroin stash in a box under his fireplace. Just then, Priscilla's tough lesbian pimp, Harriet (Dea St. Lamont), returns and fights with Coffy, who just barely escapes.With the information she got from Priscilla, Coffy sets out to infiltrate George's business. She sets up a meeting with King George and pretends to be a Jamaican hooker named Mystique. George immediately takes her into his fold, much to the chagrin of George's 'old lady', Meg (Linda Haynes). During a party at George's pad, the jealous Meg dumps a tray of cocktails in Coffy's lap. When she goes into George's bedroom to clean up, Coffy sees her opportunity and accesses his drug stash, disposing of all his heroin and replacing it with ordinary sugar. Returning to the party, she then picks a fight with Meg and winds up fending off Meg and the rest of the girls. Coffy emerges the victor when Meg cuts herself on a series of razorblades that Coffy has hidden in her afro. Arturo Vitroni witnesses the fight, and he so taken by Coffy that he requests a session with her that very night.Coffy arrives at Vitroni's house and attempts to assassinate him, but she is stopped by Omar (Sid Haig), Arturo's bodyguard. They make the mistake of believing that King George has sent Coffy to make a hit on Arturo, so they retaliate. Keeping Coffy locked up, they lure George into a limousine and then kill him by tying a rope around him and dragging him behind the vehicle.They are undecided about what to do with Coffy. One of Vitroni's goons recognizes Coffy from the night they roughed her up along with Carter; another of Virtoni's shady associates recognizes Coffy as Howard Brunswick's girlfriend. Believing her to be a hit woman, the gangsters summon Brunswick, unsure about whether he is associated with Coffy's attempted hit. Vitroni is suspicious when he realizes that Coffy and Howard do indeed know one another, but Coffy insists Howard had nothing to do with her attempt on Vitroni's life, blaming it entirely on King George. To her dismay, Howard betrays Coffy and tells Vitroni that for all he cares, they can kill her.Omar and some other goons take Coffy to a desolate area of the city with intentions of killing her and dumping the body. Along the way they inject her with some heroin they took from King George's stash--Coffy knows it's really just sugar. She distracts them with her feminine wiles and manages to stab Omar in the throat, mortally wounding him. Another goon chases Coffy out onto a busy freeway, where he is run down by a passing vehicle. The third goon, a crooked cop, tries to run Coffy down after chasing her under a bridge, but she shatters his windshield with a brick and he flips the car. Coffy steals his shotgun just before the car explodes, killing him.Coffy stashes her shotgun and hitches a ride with a stranger, luring him out of the car and stealing it once he's gone. She returns to her hiding place and retrieves the shotgun, then returns to Vitroni's and drives the car straight into the house, killing one goon who was standing on the porch. Inside she lets loose with her shotgun, killing everyone she sees until she has Vitroni cornered in a swimming pool. She toys with him and tells him she'll take a million dollar payoff to let him live, but after he tells her where Brunswick went, she shoots him anyway.Coffy's revenge isn't complete until she pays a visit to Howard. She slips into his beach house and surprises him, holding the shotgun on him. Howard is shocked to see Coffy alive, and even more shocked to hear that she's killed all of his shady associates. Howard manages to sooth Coffy, convincing her that he was only playing along with the crooks to buy time. But his speech is interrupted by a woman calling for him from upstairs; a semi-nude white woman walks out of one of the bedrooms. Coffy responds by gunning down Howard right there in his living room, as the terrified woman screams in horror. Coffy then stumbles out into the morning light, grimy and covered with bloody scratches and bruises, but alive.
question: What type of woman does Coffy pose as ?
answer: Nurse