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 many years was Taft president? Passage:Howard was born to Ossian Gregory Howard, a lawyer, and Lucy Denham Thurber on 11 June 1857. His relatives from his mother's side included the Harvard astronomer E.C. Pickering while other distant relatives included Senator J.M. Howard and President William Howard Taft. Shortly after his birth, the family moved from Rockford, to Ithaca, New York where his father worked with a law firm. Howard attended Ithaca Academy. An interest in insect collecting encouraged by his parents with the gift of The Butterfly Hunters by Mary Treat at the age of 10 followed by more books and at the age of 13, along with another collector friend, recorded the introduction of the European cabbage butterfly (Pieris rapae) in the Catskill region. Along with his friends, he founded the Ithaca Natural History Society to meet and discuss papers and insects. While out collecting one day, he met John Henry Comstock, who invited him to his lab at Cornell University. Howard enrolled in Cornell in September 1873, three years after the death of his father, and following the advice of his mother's friends, went to study civil engineering. Doing poorly in differential calculus made him drop engineering and he began to study other subjects including French, German, and Italian. He then joined Comstock's lab as the first research student and graduated in June 1877 with a thesis on respiration in the larva of Corydalis cornutus. He worked with Burt Green Wilder and Simon Henry Gage and received a masters at Cornell. In the 1880s, he also attended Columbian College (now George Washington University) for medicine, although he didn't complete it. He however received an honorary MD from the same university in 1911 for his contribution to medical entomology. 
 Links: a. William Howard Taft b. Rockford, Illinois c. John Henry Comstock d. Pieris rapae
Example Output: a

Example Input: Question: What is the seating capacity of the place where the Saracens defended their title in April 2017? Passage:Deysel signed a two-year contract to join Japanese side Toyota Verblitz at the conclusion of the 2014 Super Rugby season. On 16 March 2017, it was announced that Deysel had joined Irish Pro12 side Munster on a three-month loan as injury cover for his compatriot Jean Kleyn. On 8 April 2017, Deysel made his debut for Munster when he started against Scottish side Glasgow Warriors in a 2016–17 Pro12 fixture. Munster won 10–7, with Deysel being replaced by Peter O'Mahony in the 42nd minute. On 22 April 2017, Deysel made his European debut when he replaced Tommy O'Donnell in Munster's 2016–17 semi-final defeat at the hands of defending champions Saracens in the Aviva Stadium, Dublin. On 27 May 2017, Deysel made his final appearance for Munster when he came off the bench against Scarlets in the 2017 Pro12 Grand Final. Following the completion of his loan spell at Munster, Deysel was granted an early release from his Sharks contract and signed a two-year deal with another Irish province, this time moving to Ulster. Ulster announced on 24 October 2018, Deysel would retire from professional rugby with immediate effect.
 Links: a. Aviva Stadium b. Aviva Stadium c. Dublin d. Ulster Rugby
Example Output: a

Example Input: Question: Which Formula One driver who had won races with the Lola T332 car is the oldest? Passage:The T332 dominated the last three years of the US F5000 championship, with Briton Brian Redman taking the title three times in a row in 1974–76, his most serious rivals Al Unser and Mario Andretti, in 1974–75 in Parnelli T332C. Australian driver Warwick Brown used a T332 to win the 1975 Tasman Series as well as the 1975 New Zealand Grand Prix. In doing so he became the only Australian driver to ever win the Tasman Series. New Zealand driver Ken Smith also used a Lola T332 to win the 1976 New Zealand Grand Prix. Ken Smith had obtained Redman's 1974 US winning chassis and a couple of extremely powerful US F5000 chev engines. Lawrence, after a serious accident in the 72 NZGP regained competitive form in a new T332 in the 1974 Tasman and by 1975 had upgraded his chassis to the specs of Andretti's US car and running with real sponsorship from Malboro, Singapore Airlines and Wix, was Warwick Brown's most serious rival during the 1975 Tasman. As a side note, both the 1975 and 1976 New Zealand Grands Prix were held at Pukekohe Park Raceway. It was generally thought in the 1975 Tasman the two best drivers, Graham MacRae in a MacRae GM2 and Chris Amon in a Talon (a modified version of the GM2) were very much at a disadvantage compared with Lawrence, Brown and Smith in the Lola 332T, although to some extent that was compensated by the very fast Firestone F5000 tyres used by McRae for the last time in NZ which meant MacRae took pole or deadheated for pole time in the four kiwi rounds of the last Tasman. MacRae himself found his own T332 far faster than his GM2 in the 1974/75 US Travellers Cheque F5000 series. Although not able to equal the engine preparation of the Haas or Parnelli teams running at F1 level, even in 1975 at Watkins Geln, Lagua Seca and Long Beach, McRae in a T332 was still as quick as Jarier or Unser while his T332 lasted. In Australasia the T400 never matched the T332 although after its disastrous 1975 series, Max Stewarts T400 was often competitive in 1976 and 1977. In the Shellsport F5000 series in 1975, Peter Gethin and Pilete's T400 was probably quicker than the best T332s of Guy Edwards and Ian Ashley and in 1976 Keith Holland in a T400 often matched Edward's and David Purley 3.6 March and Chevron cars. The last two new T332c F5000s in 1977 were built for Alan Jones for the 1977 Australian Tasman rounds and Keith Holland Shellsport campaign that year. 
 Links: a. 1975 New Zealand Grand Prix b. Brian Redman c. Brian Redman d. Warwick Brown
Example Output:
b