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 player that Dolman was dismissed by in his two first-class appearances was the oldest? Passage:Dolman made his debut for Monmouthshire against Devon in the 1922 Minor Counties Championship. He played Minor counties cricket for Monmouthshire from 1922 to 1934, making 52 appearances. After 1934, Monmouthshire didn't enter a team in the Minor Counties Championship. During his career he made two first-class appearances, both for Wales. The first of these was in 1926 when Wales played Ireland, a match in which Dolman took the wicket of Gustavus Kelly in the Irish first-innings and Jim Ganly in their second-innings, while in Wales only innings he scored 11 runs before being dismissed by Gustavus Kelly. His second first-class appearance came in 1928 against the touring West Indians, a match in which he went wicket-less, while he scored 35 runs in Wales first-innings before being dismissed by Snuffy Browne. He also played for the Glamorgan Second XI in 1936.
 Links: a. Gustavus Kelly b. Minor Counties of English and Welsh cricket c. Minor Counties of English and Welsh cricket d. Wales national cricket team
Example Output: a

Example Input: Question: On what day did the season begin that Mark Sloan first appears? Passage:Mark first appears in season two, introduced as a highly respected otolaryngologist sub-specialized in plastic surgery and the childhood best friend of neurosurgeon Derek Shepherd (Patrick Dempsey). In his first appearance, he flirts with Meredith Grey, and Derek punches him in the face. Derek explains that Mark had an affair with his wife, Addison (Kate Walsh) while they were living in New York. Mark travels to Seattle, intent on convincing Addison to return with him to New York, but his offer is rejected and Derek declines to renew their friendship. Mark returns during season three at Addison's drunken behest, but she again rejects him once sober. Undeterred, Mark sells his successful private practice (which he previously shared with Derek) and takes over the plastics program at Seattle Grace Hospital. During Meredith's morphine rampage, Mark finds out about his nickname McSteamy which was given to him by her during his first trip to Seattle back when he attempted to get Addison back and earn Derek's friendship back. It is later revealed that Mark has at some point slept with all of Derek's sisters. Mark has a brief fling with Addison's friend, orthopedic surgeon Callie Torres (Sara Ramirez), and develops a friendship with Derek's girlfriend, intern Meredith Grey (Ellen Pompeo). It is revealed that after Derek left New York, Mark and Addison continued their relationship for two months, during which she conceived and aborted his child. Just weeks after moving to Seattle he quickly observes that Derek's true love was Meredith and tries to convince Addison that her marriage with Derek was over. Mark enters into a sixty-day abstinence pact with Addison, agreeing that if they can remain celibate for that time, Addison will give their relationship another chance. Addison ultimately breaks the pact by having sex with intern Alex Karev (Justin Chambers), and soon thereafter departs from Seattle to work in Los Angeles.
 Links: a. Grey's Anatomy (season 2) b. Grey's Anatomy (season 2) c. Kate Walsh (actress) d. Callie Torres
Example Output: a

Example Input: Question: What is the population of the place where the extension would connect to West Kirby? Passage:In 1873, the Hoylake and Birkenhead Railway was authorised to construct two extensions to its lines. One was a short connecting section near to Birkenhead docks, and the other was the extension from Hoylake to West Kirby. The station and the extension were opened on 1 April 1878 as the terminus of the Wirral Railway's route from Birkenhead Park station. The station's original signal box was built in 1886, to a London and North Western Railway (LNWR) design. This signal box was removed and replaced in 1932. After the opening of the Mersey Railway Tunnel in 1886, carriages were operated through Birkenhead Park, every half-hour, all the way to James Street station in Liverpool. As traffic increased, the line into West Kirby was doubled, from a single track, in 1896. After a board meeting on 28 October 1895, it was decided to extend the line from Hooton, into West Kirby. The station was relocated on the western side of the original station, with an enlarged island platform and rebuilt, in 1898-9, in red brick, with a turreted clock tower and mock Tudor frontage. A further platform was constructed for the Hooton line, on the eastern side of the original station. The site of the original station was used for goods sidings. In the present day, this is the site of The Concourse, a community building operated by Wirral Metropolitan Borough Council.
 Links: a. Birkenhead Park railway station b. Liverpool James Street railway station c. Hoylake d. Hoylake
Example Output:
c