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 city that Trey Parker and Matt Stone commuted to has a larger population? Passage:The film opens as South Park creators Trey Parker and Matt Stone leave New York City and the 2011 opening night of their Broadway production The Book of Mormon to return to Los Angeles to begin the fifteenth season of South Park. The documentary chronicles the production of the season premiere, "HumancentiPad", beginning the Thursday prior to airing. Parker and Stone, alongside producers Anne Garefino, Vernon Chatman, Bill Hader, and Susan Arneson, discuss ideas for the episode. Parker mentions his annoyance with downloading the latest version of iTunes, and being forced to comply with the software's long list of terms and conditions. The rant leads to ideas, with Parker instructing the storyboard team on how to stage a shot. The film covers various aspects of production, including voice acting, animation, lip sync, communication with standards and practices, character design, and editing.
 Links: a. Bill Hader b. The Book of Mormon (musical) c. Broadway theatre d. New York City
Example Output: d

Example Input: Question: What age bracket plays for the Real Madrid's youth system? Passage:Casillas began his career in Real Madrid's youth system, known as La Fábrica, during the 1990–91 season. On 27 November 1997, at age 16 and still a junior, he was first called up to the senior team squad to face Rosenborg in the UEFA Champions League, although he remained on the bench throughout. After spending a season with the C-team in the fourth tier, during which they won their regional group, he came into contention as the club's first-choice between the posts. In starting the 1999–2000 UEFA Champions League group stage fixture against Olympiakos on 15 September 1999, he became the youngest goalkeeper ever to feature in the competition at the time, aged 18 years and 177 days; a record which was only broken in October 2017 by Mile Svilar. Three days earlier, Casillas had made his La Liga debut in a 2–2 draw against Athletic Bilbao at San Mamés Stadium. In May 2000, he became the youngest ever goalkeeper to play in and win a Champions League final when Real Madrid defeated Valencia 3–0, just four days after his 19th birthday.
 Links: a. Olympiacos F.C. b. Real Madrid CF (youth) c. La Fábrica d. Real Madrid CF (youth)
Example Output: b

Example Input: Question: What year was Loevy's stay in London cut short? Passage:Upon completing his military service, Loevy majored in Economics and Political Science at the Hebrew University of Jerusalem. At the same time, he dabbled in theater by participating in student productions, and worked at the national Voice of Israel radio station as a program editor, actor, producer, director, and skit-writer.. In 1967, upon completing his degree, he traveled to London to attend the London Film School (then known as the London School of Film Technique). Loevy's stay in London was cut short by the Six-Day War. Loevy returned to Israel to serve in the army. Soon after the war, he returned to London to continue his studies and worked as an assistant director at Elstree Studios for the British espionage/science fiction adventure series The Champions. At the same time, he was also an announcer for the BBC's Hebrew-language department.
 Links: a. Six-Day War b. The Champions c. Hebrew University of Jerusalem d. Science fiction
Example Output:
a