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 regiments that Ellwood served in was the largest? Passage:Ellwood graduated from Duntroon in 1990 and was commissioned into the Royal Australian Infantry Corps. His early career included postings as a platoon commander in the 2nd/4th Battalion, Royal Australian Regiment and as an instructor in field training and tactics at Duntroon, before he was seconded to the British Army from 1998 for a two-year exchange with the Irish Guards, then stationed in Germany. During the secondment he deployed as part of the NATO intervention in the Kosovo War in 1999, serving as second-in-command of an armoured infantry company in the King's Royal Hussars Battle Group. For his service in Kosovo, Ellwood was awarded a Commander British Forces Commendation. He returned to Australia as a company commander and operations officer in the 5th/7th Battalion, Royal Australian Regiment (5/7RAR). Ellwood commanded B Company on operations in East Timor from October 1999 to April 2000, when 5/7RAR deployed with the International Force East Timor.
 Links: a. 2nd/4th Battalion, Royal Australian Regiment b. Kosovo War c. 2nd/4th Battalion, Royal Australian Regiment d. King's Royal Hussars
Example Output: a

Example Input: Question: Who was the champion of Liga Alef that year when Hapel Nahriya F.C. was relegated to the fourth tier and never been back since? Passage:Hapoel Nahariya spent 12 seasons in the second tier of Israeli football. They have reached the second tier for the first time in the 1953–54 season, where they placed fifth in the North division. In the following season, the club reached their best placing to date, after they finished third in Liga Alef North division. In the 1956–57 season they finished second bottom, and relegated to Liga Bet. The club returned to Liga Alef, after they finished third in the 1962–63 Liga Bet North A division, and relegated back to Liga Bet after another second bottom finish at the following season. Two seasons later, Hapoel won Liga Bet North A division, however, history repeated itself, and they were relegated in the following season (which was the "double season" of 1966–68), after yet another second bottom finish. In the 1969–70 season the club won Liga Bet North A division once again, and promoted to Liga Alef. This time, their return to Liga Alef was successful, as they finished the 1970–71 season in the fifth place in Liga Alef North, and remained in the second tier until 1976, when Liga Artzit was created and became the new second tier of Israeli football, whilst Liga Alef became the third tier. Hapoel played in Liga Alef until the 1981–82 season, when they finished bottom and relegated to Liga Bet. They did not return to the third tier of Israeli football ever since.
 Links: a. 1981–82 Liga Alef b. 1953–54 Liga Bet c. 1966–68 Liga Alef d. 1970–71 Liga Alef
Example Output: a

Example Input: Question: Of the songs compared to Marry the Night, which one is the longest? Passage:"Marry the Night" is a dance-pop and synthpop song with electro rock and house influences. The song starts out with electronic church bells and Gaga softly singing "I'm gonna marry the night/I won't give up on my life/I'm a warrior queen/Live passionately tonight." Soon the beat changes into a dance one, accompanied with techno beats, handclaps and funk music, and moves to the chorus, where Gaga stutters the line "Ma-ma-ma-marry/Ma-ma-ma-marry/Ma-ma-ma-marry the night". It was compared by Tim Jonze from The Guardian to the Eurodance song, "It's My Life" by Dr Alban, while Nicola James from MTV compared the chorus with Jennifer Lopez's 1999 single "Waiting for Tonight. In a pre-release review of certain album tracks, Peter Robinson from the NME blog wrote that Gaga channels "Whitney Houston-esque pop euphoria" into the song, notably that from the singer's musical peak.
 Links: a. It's My Life (Dr. Alban song) b. Waiting for Tonight c. Pop music d. NME
Example Output:
a