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: Did Blake or Philby defect first? Passage:In May 1986, Souther requested Soviet citizenship, aware that the investigation against him was progressing. In June, fearing imminent arrest, Souther defected to the Soviet Union by flying from the United States to Rome, where the Soviet intelligence services transferred him to Moscow. Initially, Soviet counterintelligence units were suspicious of Souther's defection and feared that he was a double agent for the CIA, but he was cleared shortly afterwards. On 2 October 1986, Souther was granted Soviet citizenship in a decree from the Presidium of the Supreme Soviet, and adopted the Russian name Mikhail Yevgenyevich Orlov. Souther was well-received by the Soviet authorities, gifting him an apartment in Moscow and a dacha on the outskirts of the city, and promoting him to the rank of major in the KGB – one of few foreign spies to be commissioned as an officer in the agency. Souther became actively engaged in scientific activities, developed his own English teaching program, walked around Moscow a lot, and travelled to other Soviet cities. Souther met and befriended other foreign Soviet intelligence agents that had defected including Kim Philby and George Blake. Souther married a Russian woman named Elena, an English teacher at the Intelligence Institute, and they had a daughter named Alexandra. In early 1989, Souther was awarded an Order of Friendship of Peoples for his contributions in the intelligence services following a petition from the KGB leadership.
 Links: a. George Blake b. George Blake c. Dacha d. Major
Example Output: a

Example Input: Question: Who was the founder of the school where Constant Mews studied for his doctorate? Passage:Mews attended the University of Auckland and completed BA and MA degrees there in History. He carried out doctoral study at the University of Oxford, followed by five years (1980–1985) teaching British civilisation at the Universite de Paris III, while pursuing studies in medieval thought (focusing on Peter Abelard) in connection with Jean Jolivet, at the École pratique des hautes études en sciences religieuses. This was followed by two years as a Leverhulme research fellow at the University of Sheffield on editing the writings of Peter Abelard. Mews took up a position at Monash University as Lecturer in the Department of History in July 1987. He became involved in developing the Centre for Studies in Religion and Theology and in promoting studies in religion more generally, with a strong interest in interfaith work. He has had spells of study at the Institute for Advanced Study, Princeton, in 1990 and 2000, and has also again taught in Paris, at the École pratique des hautes études (Ve section) and in the École des hautes études en sciences sociales.
 Links: a. Princeton, New Jersey b. University of Sorbonne Nouvelle Paris 3 c. University of Oxford d. École pratique des hautes études
Example Output: c

Example Input: Question: When was CA Osasuna founded? Passage:After his performance at the 2006 World Cup Nekounam was linked to the likes of Hertha BSC of the Bundesliga and Ligue 1's Olympique Lyonnais, but he eventually joined CA Osasuna on a two-year contract, with an option to a third year and a €5 million minimum release-fee clause on his contract – he thus became the first Iranian player to be signed by a Spanish club. On 22 February 2007, he scored in the 120th minute of the match against FC Girondins de Bordeaux for the knockout stages of the UEFA Cup to help to a 1–0 home win and aggregate score, and after a particularly successful first season began to attract interest from other European sides, notably Scotland's Rangers who had a £1 million pound offer rejected.
 Links: a. CA Osasuna b. FC Girondins de Bordeaux c. UEFA Europa League d. 2006–07 La Liga
Example Output:
a