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.

Ex Input:
Question: How old was the winner of the 18th season of Celebrity Big Brother when they won? Passage:The third series of the show began on 11 August 2015. The official list of cast members was released on 14 July 2015. This series was filmed in Cancun, Mexico, making this the first series to be filmed outside of Europe. They include four boys: Graham Griffiths, Jayden Robins, Kirk Norcross and Stephen Bear, and four girls: Amy Paige Cooke, Laura Alicia Summers, Megan McKenna and Megan Rees. With the announcement of the line-up it was confirmed that former Geordie Shore cast member and star of the first series, Vicky Pattison, would be making her return as an ex alongside Series 2 star Rogan O'Connor. The Only Way Is Essex cast member Kirk Norcross was also confirmed to be taking part in the series, with his ex-fiancée and Celebrity Big Brother star Cami-Li featuring as his ex. Star of Magaluf Weekender Jordan Davies was also revealed to be taking part in the series, also featuring as an ex. Megan McKenna and Jordan later returned for the fourth series. On 5 January 2016, cast member Megan McKenna entered the Celebrity Big Brother house to compete in the seveneeth series, and on 28 July 2016, Stephen Bear entered the house to compete in the eighteenth series where he left as the winner. Jordan Davies made another return to the show, this time during the fifth series with Jemma and Bear, and Holly also returning as an ex again. In August 2017, both Jemma Lucy and Jordan Davies took part in the twentieth series of Celebrity Big Brother.
 Links: a. Stephen Bear b. Stephen Bear c. The Only Way Is Essex d. Ibiza Weekender

Ex Output:
a


Ex Input:
Question: Which team that Lepage drove for after he left Ridling raced in NASCAR first? Passage:Lepage made his Busch Series debut in 1986 at Oxford Plains Speedway, starting 41st and finishing 15th in the No. 09 Buick owned by Carl Merrill. He became a Busch Series regular in 1994, serving as an owner/driver in the No. 71 Vermont Teddy Bear Company car and running for Rookie of the Year honors. He had a best finish of 9th at New Hampshire International Speedway, in which he got a flat tire at the very end of the race, and finished 24th in points. The 1995 season resulted in five Top 10s and finishing 18th in points. At the end of the season, he lost his sponsorship and ran his own car in 1996 unsponsored until April. Lepage then joined David Ridling and his No. 88 Ridling Motorsports team with sponsorship from Ridling's own Farmer's Choice Fertilizer. He won his first career race at the season finale Jiffy Lube Miami 300 with Hype Energy sponsorship. He finished eighth in points with 1 win, three Top 5s and 10 Top 10s. He ran most of the 1997 season driving for Ridling before leaving due to the team losing its sponsor. Lepage would finish out the year running for Phoenix Racing and ST Motorsports. He finished 12th in points, posting three Top 5s and six Top 10s. Lepage had his Cup debut by qualifying for the Fall Charlotte race in the No. 91 LJ Racing car in an impressive 12th. He would also run the Fall Talladega and Atlanta races with finishes of 17th at Talladega and 29th at Atlanta.
 Links: a. Oxford Plains Speedway b. Phoenix Racing (NASCAR team) c. Ford EcoBoost 300 d. 1997 NASCAR Busch Series

Ex Output:
b


Ex Input:
Question: How long did the general who captured Roussel rule as the Byzantine Emperor? Passage:He was present at the Battle of Manzikert in 1071, where he refused to join the fray; the battle proved to be a disastrous defeat for the Byzantines. Despite this treachery, he was kept in imperial service, where good generals were needed, and was sent into Asia Minor again with a force of 3,000 Franco-Norman heavy cavalry. There Roussel conquered some territory in Galatia and declared it an independent state in 1073, with himself as prince, following the example set by his fellow Normans in the Mezzogiorno. His capital was Ankara, now the capital of Turkey. He defeated the Caesar John Ducas and sacked Chrysopolis, near Constantinople. He even supported a usurper candidate, but by formally ceding lands that the Seljuk Turks had actually conquered, the emperor Michael VII persuaded the Seljuk warlord Tutush I to remove Roussel. However both Ducas and Roussel were defeated and captured by Turkish forces, fortunately for Roussel his wife was able to pay the ransom demanded by the Turks allowing Roussel to return to Amasea, where the population so loved him that he made himself undisputed governor. He was given up by the people through a ploy of Alexius Comnenus (1074), then a general, later an emperor. 
 Links: a. Seljuq dynasty b. Alexios I Komnenos c. Constantinople d. John Doukas (Caesar)

Ex Output:

b