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 teams Boswell played for was the oldest? Passage:Born in Chester, Boswell joined local football club Chester F.C. upon leaving school, initially as an amateur. He remained with the club until the outbreak of the Second World War, but never made it to the club's first team. During the war he served with the Royal Engineers and also made appearances as a guest player for Sheffield Wednesday during unofficial wartime competitions. He was later posted to Barton Stacey in Hampshire, where he helped his unit's football team win a major Army Football Association trophy. Upon leaving the army in 1946 he joined Gillingham, who at the time were playing in the Kent League. Gillingham manager Archie Clark also signed four other players who had served with Boswell at Barton Stacey and played alongside him in the unit football team, namely Jackie Briggs, George Forrester, Hughie Russell and Vic Hole.
 Links: a. Chester City F.C. b. Army Football Association c. Hampshire d. Kent Football League (1894–1959)
Example Output: a

Example Input: Question: How old was Warren Harding the year Coolidge was born? Passage:Calvin Coolidge (born John Calvin Coolidge Jr.; ; July 4, 1872 – January 5, 1933) was an American politician and lawyer who served as the 30th president of the United States from 1923 to 1929. A Republican lawyer from New England, born in Vermont, Coolidge worked his way up the ladder of Massachusetts state politics, eventually becoming governor of Massachusetts. His response to the Boston Police Strike of 1919 thrust him into the national spotlight and gave him a reputation as a man of decisive action. The next year, he was elected vice president of the United States, and he succeeded to the presidency upon the sudden death of Warren G. Harding in 1923. Elected in his own right in 1924, he gained a reputation as a small government conservative and also as a man who said very little and had a rather dry sense of humor.
 Links: a. Vice President of the United States b. Politics c. Boston Police Strike d. Warren G. Harding
Example Output: d

Example Input: Question: How many Stanley Cups did Joel Quenneville win with the Blackhawk's? Passage:During the 2014–15 season, Kane emerged as one of the NHL's leading scorers. He was elected to the 2015 NHL All-Star Game in Columbus, Ohio. He scored 64 points (27 goals and 37 assists) through the regular season. He injured his left clavicle on February 24, 2015, after he was cross-checked into the boards while stumbling towards the ice by Alex Petrovic in a game against the Florida Panthers. Kane underwent surgery and was expected to miss 12 weeks. At the time of his injury, he was leading the NHL in points. However, he recovered earlier than initially projected and returned to the Blackhawks at the start of the 2015 playoffs. Chicago head coach Joel Quenneville moved Kane to the Blackhawks' top line alongside Jonathan Toews and Brandon Saad after the Anaheim Ducks took a 3–2 game lead in the Western Conference Finals. The trio combined for nine points over the final two games and propelled the Blackhawks to the Stanley Cup Finals. Kane helped the Blackhawks defeat the Tampa Bay Lightning by assisting on Duncan Keith's game-winning goal in Game 6 and scoring an insurance goal for his third Stanley Cup championship in six years. Kane finished the playoffs with 11 goals and 12 assists, tying the Lightning's Tyler Johnson with a playoff-high 23 points.
 Links: a. 2014–15 NHL season b. Joel Quenneville c. 2015 Stanley Cup playoffs d. 2014–15 NHL season
Example Output:
b