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: How long did the state entity that  Macedonia was the political heart of  last? Passage:In 1014, after decades of war, the Byzantine Emperor Basil II scored a decisive victory over the Bulgarian Emperor Samuil in the battle of Kleidion. Samuil died of a heart attack on 6 October 1014 and the Byzantines took the opportunity to penetrate deep into Macedonia, the political heart of the Bulgarian Empire, and seized a number of important cities (Bitola, Prilep, Voden, Maglen). After the new Bulgarian Emperor Ivan Vladislav, who in 1015 assassinated Samuil's son and heir Gavril Radomir, had unsuccessfully tried to make an agreement with Basil II, he organized the defense of the country. The Bulgarians led by the Emperor, Krakra of Pernik and Ivats managed to return a number of towns and castles. The Byzantines were defeated in the battle of Bitola (September 1015) and at the siege of Pernik (summer of 1016).
 Links: a. Basil II b. Ivan Vladislav of Bulgaria c. First Bulgarian Empire d. Prilep
Example Output: c

Example Input: Question: Are both football clubs that Hill's team played in the 2002-03 season FA Cup located in England? Passage:He led the club to the Isthmian League title and promotion to the Conference in his first season in charge. The following season, Hill's side finished third in the Conference and took Premiership Charlton Athletic to a replay in the Third Round of the FA Cup. They again reached the FA Cup Third Round in the 2001-02 season, losing 4-1 to Ipswich Town after taking the lead, and finished second in the Conference, missing promotion to the Football League on goal difference. The following season saw another run in the FA Cup, beating Plymouth Argyle after a replay in the Third Round before losing 1-0 to Norwich City thanks to an injury time goal. Their league form was not particularly good until the latter stages of the season when they won eleven consecutive games and qualified for the play-off final, losing 3-2 in extra-time to Doncaster Rovers. The 2003-04 season was not a success and Hill resigned soon after a 9-0 defeat at home to Hereford United late in the season.
 Links: a. Doncaster Rovers F.C. b. Charlton Athletic F.C. c. Plymouth Argyle F.C. d. Isthmian League
Example Output: c

Example Input: Question: When were the Cleveland Browns founded? Passage:Patricia joined the Patriots under head coach Bill Belichick as an offensive coaching assistant in 2004. In 2005, upon the departure of assistant offensive line/tight ends coach Jeff Davidson, Patricia was reassigned as the Patriots' assistant offensive line coach. Then-linebackers coach Dean Pees was promoted to defensive coordinator after the season, prompting another reassignment for Patricia, this time to linebackers coach for the 2006 season. Patricia was named the team's safeties coach in 2011. In 2012, he was promoted to the title of defensive coordinator, though he had been calling the plays on defense since the departure of Pees following the 2009 season. In January 2016, the Patriots gave permission for Patricia to interview for the head-coaching position of the Cleveland Browns, but Patricia would remain with the Patriots as defensive coordinator going into the 2016 season. The Patriots won three Super Bowls with Patricia: Super Bowl XXXIX at the end of the 2004 season, Super Bowl XLIX at the end of the 2014 season, and Super Bowl LI at the end of the 2016 season. On January 1, 2018 (NFL Black Monday), it was revealed that Patricia was the subject of the Detroit Lions' and New York Giants' head coaching searches. 
 Links: a. Super Bowl LI b. Defensive coordinator c. Cleveland Browns d. 2009 New England Patriots season
Example Output:
c