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.

Input: Consider Input: Question: How long after Markos' mission to the Pope did Martin V pass away? Passage:He first appears in Constantinople in 1401, qualified as an oikeios of the emperor. In 1417 he was possibly sent on a diplomatic mission to the Venetians in the Morea. In 1422 and again in 1429 he was sent by Emperor John VIII Palaiologos as an envoy to the Ottoman Sultan Murad II. At the time he had the relatively lowly rank of protovestiarites, but was quickly promoted to protostrator and then to the senior rank of megas stratopedarches, which he held already during his mission in 1430 to Pope Martin V. During his return from the mission to the Pope, on orders from the Emperor, he raised Thomas Palaiologos to the rank of Despot in the Morea. He led two more missions abroad, one in 1433 to Pope Eugene IV, and one in 1438 to Venice.
Links: a. Ottoman Empire b. Constantinople c. Pope Martin V d. John VIII Palaiologos

Output: c

Input: Consider Input: Question: Comparing the places Naipaul visited while writing his book, what is the difference in population between the two? Passage:Black & White is a non-fiction book written by Shiva Naipaul and published by Hamish Hamilton in the U.K. in 1980. It was published with the title Journey to Nowhere: A New World Tragedy in the U.S. The book is based on Naipaul's trip to Guyana in the aftermath of the Jonestown Massacre, and his subsequent trip to the United States, in which he explored links between the People's Temple and other groups and individuals. Naipaul attempted to connect Rev. Jim Jones, founder of the People's Temple, with disparate parts of California's counterculture, and Guyanese and other Third World governments and the revolutionary ideologies which supported them. Naipaul was highly critical of these and other movements, including black theology, the nascent New Age movement and EST, in as much as they helped, in his analysis, to create fertile ground for the People's Temple to flourish on the two continents. The book's US paperback cover tagline reads "How American ideas and ideologies led to the mass suicide of 900 people in Jonestown, Guyana."
Links: a. Guyana b. Jonestown c. Liberation movement d. Shiva Naipaul

Output: a

Input: Consider Input: Question: Who was the first coach of the team Davide scored his first goal against? Passage:On 30 August 2011, Santon signed for English club Newcastle United on a five-year contract, for an undisclosed fee; according to Inter, Santon was sold for 4million. He made his Newcastle debut on 16 October 2011 as a second-half substitute against Tottenham Hotspur. He went on to make his first Premier League start for the club in December away against Norwich City, before making his full home debut the next week against Swansea City. He set up Papiss Cisse's first goal in the Magpies' shock win at Chelsea in the 19th minute. Halfway through the 201213 season, Santon was the only Newcastle player to have started every Premier League match. In the 32 win over Chelsea on 2 February 2013, he assisted the first goal with a cross for Jonas Gutierrez, and the winning goal scored by Moussa Sissoko. He scored his first goal for Newcastle on 17 March, an equaliser against Wigan Athletic.
Links: a. Premier League b. Jonas Gutierrez c. Wigan Athletic F.C. d. Jonas Gutierrez
Output: c