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: Who was in charge at Princeton University the year Barschall graduated from that school? Passage:Barschall was born as Heinrich Hermann Barschall in Berlin, Germany; his father was a patent attorney who had received a Ph.D. in chemistry after studying with Nobel Laureates Emil Fischer and Fritz Haber. After beginning study in several universities in Germany, he emigrated to the United States in 1937 during the early Holocaust period; though raised as a Lutheran, he had some Jewish ancestry. He received his Ph.D. from Princeton University in 1940 under the direction of Rudolf Ladenburg; he also worked closely with John A. Wheeler. After a suggestion by Niels Bohr, he carried out in only a few days with fellow graduate student Morton H. Kanner the first demonstration of fission by fast neutrons and thorium and uranium. His thesis was on the interaction of fast neutrons with helium. In a paper with John A. Wheeler he reported the discovery of spin-orbit coupling in neutron scattering.
 Links: a. Emil Fischer b. Princeton University c. Jews d. John Archibald Wheeler
Example Output: b

Example Input: Question: How long had the Senator held his position before he helped Thurmond to try to get Schweiker off the ticket? Passage:In the 1976 Republican primary, President Ford faced a challenge from former California Governor Ronald Reagan, who selected Richard Schweiker as his running mate. Though Thurmond backed Reagan's candidacy, he, along with North Carolina Senator Jesse Helms, led efforts to oust Schweiker from the ticket. During the subsequent general election, Thurmond appeared in a campaign commercial for incumbent U.S. President Gerald Ford in his race against Thurmond's fellow Southerner, former Georgia Governor Jimmy Carter. In the commercial, Thurmond said Ford (who was born in Nebraska and spent most of his life in Michigan) "sound[ed] more like a Southerner than Jimmy Carter". After President-elect Carter nominated Theodore C. Sorensen as his choice to become Director of the Central Intelligence Agency, Thurmond expressed reservations and fellow Senator Jake Garn said he believed Thurmond would not vote for the nomination. Sorensen withdrew from consideration days later, before a vote could be had.
 Links: a. Jimmy Carter b. Director of the Central Intelligence Agency c. Jimmy Carter d. Jesse Helms
Example Output: d

Example Input: Question: In the two roles in which Brian Wilde had minor roles in 1967, which one made the most money? Passage:He had an early uncredited role as a small-time crook in the 1954 film Forbidden Cargo, starring Jack Warner and Nigel Patrick, and a small but significant and dramatic part in the horror film Night of the Demon (1957). His early television work included the series The Love of Mike (1960) and supporting Tony Hancock in episodes of his ATV series in 1963. Wilde also played Detective Superintendent Halcro in a series of two-part thrillers about undercover Scotland Yard officers, The Men from Room Thirteen (BBC, 1959–61). He had minor roles in films such as Life for Ruth (1962), The Bargee (1964), The Jokers (1967) and Carry On Doctor (1967), and on television in Room at the Bottom (1966–67) as Mr Salisbury. His first major television success was in 1970 as refuse depot manager "Bloody Delilah" in the ITV sitcom The Dustbinmen. He showed his sinister side as the mischievous magician Mr Peacock in the children's drama series Ace of Wands between 1970 and 1972. That year he starred as a murderer in The Uninvited, an episode of the BBC's supernatural thriller series Out of the Unknown. Also in 1971, in the television drama Elizabeth R, Wilde played the efficient, merciless 'rackmaster' Richard Topcliffe, who was charged with the torture of prisoners in the Tower of London. He played a character in the 1970s British children's series The Ghosts of Motley Hall, by Richard Carpenter.
 Links: a. The Ghosts of Motley Hall b. Carry On Doctor c. The Jokers d. BBC
Example Output:
b