In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".

Ex Input:
Density is also an important physical property of matter. The concept of density combines what we know about an objects mass and volume. Density reflects how closely packed the particles of matter are. When particles are packed together more tightly, matter is more dense. Differences in density of matter explain many phenomena. It explains why helium balloons rise. It explains why currents such as the Gulf Stream flow through the oceans. It explains why some things float in or sink. You can see this in action by pouring vegetable oil into water. You can see a colorful demonstration in this video. <sep>What physical property of matter combines what we know about an object's mass and volume?<sep>Gravity

Ex Output:
No


Ex Input:
(OPRAH.com) -- Chris Rock is an Emmy-winning comedian, devoted husband and loving father --but it's time to get to know a new side of this funnyman. Meet Chris Rock, hair expert. It's a detour he took after an innocent carpool ride left Rock with an idea he just couldn't shake. "I was with my daughter one day, and we're in the car and she's with one of her friends in the back seat, a little white friend," he says. "She was just kind of raving about her friend's hair a little too much for my comfort [saying]: 'You've got great hair. Oh, your hair's so good.'" Not wanting to make her comments a big deal, Rock says he tried to play his them off. "[I said]: "Oh, baby, your hair's beautiful. Come on,'" he says. "If I would have really reacted, then she would have a complex about her hair." Still, Rock couldn't let it go. "It sparked something in me," he says. Oprah.com: Oprah's hair throughout the years! What Rock discovered is a $9 billion industry that affects the daily activities, wallets, self-esteem -- and even the sex lives -- of black women. Because women spend so much time and money on their hair, Rock says men are forced to adopt a hands-off policy. "You cannot touch a black woman's hair. You are conditioned not to even go there," he says. "When I was a dating guy, I dated women from different races. Anytime I was with an Asian or a Puerto Rican girl or a white girl, my hands would constantly be in their hair. <sep>Which women do not allow men to touch their hair, according to Chris Rock?<sep>White women

Ex Output:
No


Ex Input:
Eric , a young boy , is excited about his birthday after reading a book and believes that a train will come for him , despite his sister Jill's disbelief .  A few hours later , the train station's control tower wakes up and in the roundhouse , Tillie , a young little blue switcher engine , along with her best bird friend , Chip , wakes up four other trains : Georgia , a kind all-purpose engine , Farnsworth , a stuck-up passenger engine , Jebediah , a worn-out old engine , and Pete , a gruff , burly freight engine .  After the tower assigns Farnsworth and Pete their jobs , Tillie tries to help with the milk train assigned to Jebediah , but the tower insists that she is too small for the job .  Georgia is assigned to pull the birthday train .  A clown named Rollo leads the toys into the train , including Stretch , a basketball player ; Missy , a ballerina ; a Handy Pandy , a panda ; Perky , an elephant ; and Grumpella , a stuffed bird .  During her journey , Georgia breaks down and is taken back to the roundhouse by Doc .  Left behind , Rollo eventually takes Doc's advice of flagging down one of the other engines returning from their daily runs over the mountain .  Farnsworth and Pete turn down their offers to pull the train .  Meanwhile , Tillie asks the tower to rescue the stranded train , but he insists that Tillie will never do the job .  Jebediah turns down his offer to pull the train because of his age , and returns to the roundhouse .  Chip and Tillie sneak past the sleeping tower and pulls the birthday train up a mountain . <sep>Which engine pulls the toys up a mountain?<sep>Georgia

Ex Output:

No


