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: Who owns the tallest building in Dubai? Passage:Dubai, the largest city in the United Arab Emirates, is home to many modern high-rises, 108 of which stand taller than . The tallest building in Dubai is the Burj Khalifa, which rises and contains 163 floors. The tower has stood as both the tallest building in the world and the tallest man-made structure of any kind in the world since its completion in January 2010. The second-tallest building in Dubai is the Marina 101, which also stands as the world's second tallest residential skyscraper. The skyscrapers of Dubai are, for the most part, clustered in three different locations. The land along E 11 Road was the first to develop, followed by the Dubai Marina neighborhood and the Business Bay district.
 Links: a. List of tallest buildings b. Burj Khalifa c. Burj Khalifa d. Burj Khalifa
Example Output: b

Example Input: Question: How old was Rudy Vallee when he reached number 15 on the Billboard charts? Passage:Rudy Vallee was the first artist to make the charts in Billboard magazine with "As Time Goes By" when he took the song to number 15 in 1931, but after the song was featured in the film Casablanca his recording was reissued and spent four weeks at number one in 1943. "Begin the Beguine" was first put on the charts by Xavier Cugat & His Waldorf-Astoria Orchestra with Don Reid on vocal for two weeks in 1935 when it reached number 13. Patti Austin's "We're in Love" made it to number 90 on the magazine's R&B chart in February 1978, and the Expanded Edition CD bonus track "I Never Said I Love You" was first recorded by Barbara Mandrell for her 1976 album Midnight Angel but was a number 84 pop hit for Orsa Lia that also spent a week at number one on the magazine's Easy Listening chart in 1979.
 Links: a. Waldorf Astoria New York b. Casablanca (film) c. Barbara Mandrell d. Rudy Vallée
Example Output: d

Example Input: Question: Which of Harvey's signings the following season was younger? Passage:1973–74 was a big season for Newcastle United. The new attacking team put together by Harvey was being tipped to take one of the major honours come the season's end. By November Newcastle were second in the league, but they fell away to finish 15th, and in the League Cup they were knocked out in the third round. It was down to the FA Cup. Hendon were first up in the third round and a shock 2–2 draw at home meant that Newcastle had to go through a replay at Vicarage Road to see off the non-league side 3–0. Scunthorpe United were next up in the fourth round, and another shock 1–1 draw at St James' meant another replay against lower league opposition. Macdonald scored twice in the replay to crush Scunthorpe's hopes in a 3–0 win. The fifth round saw a difficult away draw to West Bromwich Albion, on a quagmire of a pitch and in front of the TV cameras. Newcastle were majestic, winning 3–0 with Macdonald scoring again. Newcastle faced Burnley at Hillsborough in the semi final. Macdonald scored two and Newcastle won 2–0; Harvey would sign Burnley defender Geoff Nulty for the next season after impressing in this game. Newcastle United were through to their first FA Cup final since 1955, where they would play Bill Shankly's Liverpool. Newcastle had a poor build up to final with preparations not going to plan: the tracksuit tops the players were meant to be wearing did not turn up, and they had to wear an unkind-looking purple outfit as they walked out at Wembley Stadium. Macdonald was the key man for Newcastle, having scored in every round for a total of eight goals in the competition. Liverpool played well and coasted to a 3–0 win with Kevin Keegan scoring twice. It was the end of an era for Harvey; the next season he signed Micky Burns and paid Sheffield Wednesday a club record £200,000 for Tommy Craig, but Newcastle could only finish a low 15th, despite getting some revenge on Liverpool, beating them 4–1 at St James' Park.
 Links: a. Kevin Keegan b. Hillsborough Stadium c. Geoff Nulty d. Micky Burns
Example Output:
d