In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Example Input: Question: When did the person who voices Itchy begin acting professionally? Passage:The Itchy & Scratchy Show (often shortened as Itchy & Scratchy) is a fictional animated television series featured in the American animated television series The Simpsons. It appears as a part of The Krusty the Clown Show. Itself an animated cartoon, The Itchy & Scratchy Show depicts a blue mouse, Itchy (voiced by Dan Castellaneta), who repeatedly kills a black cat, Scratchy (voiced by Harry Shearer). The cartoon first appeared in The Tracey Ullman Show short "The Bart Simpson Show", which aired November 20, 1988. The cartoon's first appearance in The Simpsons was in the 1990 episode "There's No Disgrace Like Home". Typically presented as 15- to 60-second-long cartoons, the show is filled with gratuitous violence that almost invariably prompts uproarious laughter from Bart and Lisa. The Simpsons also occasionally features characters who are involved with the production of The Itchy & Scratchy Show, including Roger Meyers Jr. (voiced by Alex Rocco, and, later, Hank Azaria), who runs the studio and produces the show.
 Links: a. Reset button technique b. The Simpsons shorts c. Dan Castellaneta d. Story within a story
Example Output: c

Example Input: Question: How long was the event where Norton made his first of four combat jumps as an executive officer? Passage:Norton's first assignment out of West Point was to 12th Infantry Regiment, 4th Infantry Division as a company commander. He then returned to Infantry School in the fall of 1942 to attend the Battalion Commander and Staff Officers Course and the Parachute Course. Following his completion of the course, he reported to the 82nd Airborne Division in North Africa. He was soon promoted to executive officer of the 2d Battalion, 505th Parachute Infantry Regiment. Two months later, he was again promoted, to S-3 (operations officer) of the Regiment. He made his first of four combat jumps as an executive officer, participating in the Invasion of Sicily. After returning to North Africa, he made a second combat jump into Salerno, Italy, blocking German forces who were trying to attack US amphibious forces. His third jump was in support of the Invasion of Normandy on D-Day, 6 June 1944. In July of that year, he assumed command of the 3d Battalion; he was promoted the next month to G3 of the 82d Airborne Division. Norton made his fourth combat jump in September, in the Netherlands to take control of the bridges from the Dutch border to Arnhem as part of Operation Market Garden.
 Links: a. 82nd Airborne Division b. Operation Market Garden c. Netherlands d. Allied invasion of Sicily
Example Output: d

Example Input: Question: Who was the host for the 2002 Women's Chess Olympiads where Zapata competed? Passage:In 1999, in Santiago won the Pan American Girl's Chess Championship in the age group U20, and in 2000 in Bento Gonçalves won the Pan American Girl's Chess Championship in the age group U18. In 2002, in La Paz she was the second in the Pan American Girl's Chess Championship in the age group U20. In August 2005, she was second in the Pan American Women's Chess Championship, only in a tie-break after losing to Argentinean chess player Claudia Amura. She won four times in the Peruvian Women's Chess Championships: 2000, 2002, 2003 and 2004. In October 2005, after winning the FIDE South America zone tournament, she qualified for the Women's World Chess Championship. In 2006, in Yekaterinburg she participated in the Women's World Chess Championship, where won Kateryna Lagno in the first round, but in the second round lost Svetlana Matveeva. After repeated won the FIDE South America zone tournament in 2007 in Trujillo, where she surpassed her compatriot Deysi Cori, was selected at Women's World Chess Championship in Nalchik, but refused to participate, and her rival in the first round Antoaneta Stefanova went to the second round without a fight. Played for Peru at three Women's Chess Olympiads (2002—2006). In 1999, she was awarded the FIDE International Women International Master (WIM) title.
 Links: a. Deysi Cori b. Yekaterinburg c. Svetlana Matveeva d. Chess Olympiad
Example Output:
d

