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 were the other members of the Mighty Magyars? Passage:Budai made his debut for Hungary on 2 May 1949 in a 6-1 win against Austria in the Central European Championship. He subsequently played 39 times for Hungary and scored 10 goals. Four of these goals came in a 12-0 win against Albania on 24 September 1950. As one of the legendary Mighty Magyars, he helped Hungary become Olympic Champions in 1952 and Central European Champions in 1953. He also played in the Hungary side that defeated England 6-3 at Wembley Stadium. During the 1954 FIFA World Cup he played in the group stage in the 9-0 win against South Korea and in the semi-final against Uruguay. However, despite an excellent performance in the latter game, he was dropped for the final to make room for Ferenc Puskas. He also played two games at the 1958 World Cup.
Links: a. South Korea national football team b. Golden Team c. 1954 FIFA World Cup d. Golden Team
Example Output: b

Example Input: Question: What is the setting of the opera in which Sheridan appeared in July of 1919? Passage:Sheridan had her early vocal training while at school at the Dominican Convent in Eccles Street, Dublin, with additional lessons from Vincent O'Brien. In 1908, she won a gold medal at the Feis Ceoil. From 1909 to 1911 she studied at the Royal Academy of Music in London, during which time she was introduced to the Italian inventor Guglielmo Marconi, who was instrumental in arranging further studies for her in opera in Rome. With Marconi's help she auditioned in 1916 for Alfredo Martino, a prominent singing teacher attached to the Teatro Costanzi, and she made her debut there in January 1918 in Puccini's La Boheme. In July 1919 she appeared at the Royal Opera House (Covent Garden) in the title role in Iris by Pietro Mascagni. Sheridan returned to Italy, where her career continued to grow, with performances at the Teatro Dal Verme in Milan and at the Teatro San Carlo in Naples, primarily in Puccini roles. In 1922 she first sang at La Scala, Milan, in La Wally by Catalani under the direction of Toscanini. For the next few years she would sing at La Scala with great success. Perhaps her greatest role was Madama Butterfly, which she sang extensively in Italy and at Covent Garden. When she played the part of Madama Butterfly, Puccini was said to be spellbound.
Links: a. Arturo Toscanini b. Iris (opera) c. La Wally d. Teatro Dal Verme
Example Output:
b