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: Which of the two who collaborated together in the Dark Knight Trilogy films is older? Passage:Michael Caine is an English actor who has appeared in over 130 films and has had multiple television appearances. Caine's acting career began in the 1950s, when he was cast in many small, often uncredited roles in British films. Caine gained recognition as one of the most famous actors of the 1960s through his breakthrough role in the film Zulu (1964). He then portrayed spy Harry Palmer in the films The Ipcress File (1965), Funeral in Berlin (1966) and Billion Dollar Brain (1967). He also had starring roles in The Italian Job and Battle of Britain (both 1969). His role in Sleuth (1972) led him to an Academy Award for Best Actor nomination. Caine has won a Best Supporting Actor Oscar for the films Hannah and Her Sisters (1986) and The Cider House Rules (1999). More recently, Caine has gained a new following through his collaborations with British-American filmmaker Christopher Nolan in the Dark Knight Trilogy films, as well as Inception (2010) and Interstellar (2014).
 Links: a. Michael Caine b. Funeral in Berlin (film) c. Christopher Nolan d. Zulu (1964 film)
Example Output: a

Example Input: Question: How old was the Liberal Unionist MP when he died? Passage:Morton first stood for Parliament at the 1885 general election, when he contested Hythe, and was unsuccessful again in Christchurch at the 1886 election. He won a seat three years later, when he was elected at a by-election in October 1889 as the Member of Parliament (MP) for Peterborough, after the death of the Liberal Unionist MP John Wentworth-FitzWilliam, becoming the 81st new MP since the general election in 1886. His victory was unexpected, and when the result was declared he said that he hoped his victory would be seen as a gesture of conciliation Ireland. He was re-elected in 1892, and raised in Parliament the issue of the appointment of Justices of the Peace (magistrates) in April 1893. In November that year, 280 Gladstonian MPs met the Lord Chancellor, Lord Herschell, in the House of Lords to discuss the system. Morton led the response to the Lord Chancellor's explanation and defence of the existing system of appointment, and denounced the reliance on advice from Lord Lieutenants who were entirely dependent on what Morton called "class cliques". He was also a member of a Select Committee set up to examine the accommodation provided for members and officials of the House of Commons. Great Western Railway
 Links: a. Great Western Railway b. Parliament of the United Kingdom c. John Wentworth-FitzWilliam d. Hythe (UK Parliament constituency)
Example Output: c

Example Input: Question: On what gaming system was Crash Team Racing released on? Passage:Evan Wells graduated from Stanford University in 1995 with a computer science degree. He worked at Sega in 1993, working on ToeJam & Earl in Panic on Funkotron (1993) as a lead tester, before working at Crystal Dynamics from 1994 to 1998, working on Gex (1998) as a programmer, and  (1998) as lead designer. Wells then moved to Naughty Dog, where he worked on  (1998), Crash Team Racing (1999),  (2001), Jak II (2003), Jak 3 (2004) and  (2005). Following the departure of founders Jason Rubin and Andy Gavin in 2004, Wells became co-president of Naughty Dog alongside Stephen White; White was replaced by Christophe Balestra after a year. Wells continued to work as co-president during the release of the Uncharted titles (2007–17), as well as The Last of Us (2013). Balestra retired from the company in April 2017; Wells remains the sole president. Neil Druckmann was promoted to Vice President in March 2018.
 Links: a. Neil Druckmann b. Crash Team Racing c. Jak II d. The Last of Us
Example Output:
b