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: What is the current age of the U.S. Army soldier who were held captive by the Taliban for five years? Passage:Serial is an investigative journalism podcast hosted by Sarah Koenig, narrating a nonfiction story over multiple episodes. The series was co-created and is co-produced by Koenig and Julie Snyder and developed by This American Life. Season one investigated the 1999 murder of Hae Min Lee (Hangul: ), an 18-year-old student at Woodlawn High School in Baltimore. Season two focused on Sergeant Bowe Bergdahl, an American Army soldier who was held for five years by the Taliban, and then charged with desertion. Season three, which debuted in September 2018, explores cases within the Justice Center Complex in the Cleveland area. Serial ranked number one on iTunes even before its debut and remained there for several weeks. Serial won a Peabody Award in April 2015 for its innovative telling of a long-form nonfiction story. As of September 2018, episodes of seasons one and two have been downloaded over 340 million times, establishing an ongoing podcast world record.
Links: a. Cleveland b. Bowe Bergdahl c. Bowe Bergdahl d. Desertion
Example Output: b

Example Input: Question: Are both football clubs that Hill's team played in the 2002-03 season FA Cup located in England? Passage:He led the club to the Isthmian League title and promotion to the Conference in his first season in charge. The following season, Hill's side finished third in the Conference and took Premiership Charlton Athletic to a replay in the Third Round of the FA Cup. They again reached the FA Cup Third Round in the 2001-02 season, losing 4-1 to Ipswich Town after taking the lead, and finished second in the Conference, missing promotion to the Football League on goal difference. The following season saw another run in the FA Cup, beating Plymouth Argyle after a replay in the Third Round before losing 1-0 to Norwich City thanks to an injury time goal. Their league form was not particularly good until the latter stages of the season when they won eleven consecutive games and qualified for the play-off final, losing 3-2 in extra-time to Doncaster Rovers. The 2003-04 season was not a success and Hill resigned soon after a 9-0 defeat at home to Hereford United late in the season.
Links: a. Doncaster Rovers F.C. b. Charlton Athletic F.C. c. Plymouth Argyle F.C. d. Isthmian League
Example Output: c

Example Input: Question: How old was Eric Temple Bell when Ross was an assistant professor at St. Louis University? Passage:Ross married Bertha (Bee) Halley Horecker, a singer-musician and daughter of Ross's Chicago neighbors, in 1931, received a National Research Council Fellowship for 1932, and worked as a National Research Council postdoctoral fellow at California Institute of Technology with Eric Temple Bell until 1933. Ross moved back to Chicago and led the mathematics department at an experimental school started by Ph.D.s during the Great Depression, People's Junior College, where he also taught physics. Ross became an assistant professor at St. Louis University in 1935 and stayed for about 11 years. In an interview, he said he advocated for a student who became the first black woman in the South to receive a master's degree in mathematics. This exception led the university to admit black students despite the idea's widespread unpopularity. During World War II, Ross served as a research mathematician for the U.S. Navy. He befriended Hungarian mathematician Gabor Szego while in St. Louis, who recommended Ross for a 1941 Brown University summer school that prepared young scientists to assist in the war, a program Ross attended. He occasionally worked on proximity fuzes for Stromberg-Carlson's laboratory from 1941 to 1945 before accepting a position as head of University of Notre Dame's mathematics department in 1946. He set out to change the school's research climate by inviting distinguished mathematicians including Paul Erdos, whom Ross made a full professor.
Links: a. Gabor Szego b. Saint Louis University c. Paul Erdos d. Eric Temple Bell
Example Output:
d