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 old was Nusslein-Volhard when she won the Nobel Prize in Physiology and Medicine? Passage:The concept of the morphogen has a long history in developmental biology, dating back to the work of the pioneering Drosophila (fruit fly) geneticist, Thomas Hunt Morgan, in the early 20th century. Lewis Wolpert refined the morphogen concept in the 1960s with the French flag model, which described how a morphogen could subdivide a tissue into domains of different target gene expression (corresponding to the colours of the French flag). This model was championed by the leading Drosophila biologist, Peter Lawrence. Christiane Nusslein-Volhard was the first to identify a morphogen, Bicoid, one of the transcription factors present in a gradient in the Drosophila syncitial embryo. She was awarded the 1995 Nobel Prize in Physiology and Medicine for her work explaining the morphogenic embryology of the common fruit fly. Groups led by Gary Struhl and Stephen Cohen then demonstrated that a secreted signalling protein, Decapentaplegic (the Drosophila homologue of transforming growth factor beta), acted as a morphogen during the later stages of Drosophila development.
Links: a. Christiane Nusslein-Volhard b. Lewis Wolpert c. Lewis Wolpert d. Transcription factor
Example Output: a

Example Input: Question: How many years did the war last that coincided with Bracton's retirement? Passage:Plucknett describes Bracton in this way: "Two generations after Ranulf de Glanvill we come to the flower and crown of English jurisprudence Bracton." Bracton was born around 1210 in Devon and had a great deal of preferment in the Church. He either derived from Bratton Fleming or Bratton Clovelly. Both villages are in Devon. It was only after his death that the family name appears as Bracton; during his life, he was known as Bratton, or Bretton. This originally may have been Bradton, meaning "Broad Town". Bracton first appeared as a justice in 1245. From 1248 until his death in 1268 he was steadily employed as a justice of the assize in the southwestern counties, especially Somerset, Devon and Cornwall. He was a member of the coram rege, also called the coram ipso rege, later to become the King's Court. He retired from this in 1257, shortly before the meeting of the Mad Parliament in 1258 at Oxford. It is unknown whether his retirement was related to politics. His leaving coincided with the onset of the notorious Second Barons' War in 1264. At that time Bracton was ordered to restore to the Treasury the large store of plea rolls (case records from previous trials) that had been in his possession. He was also forced to surrender the large number of rolls from his predecessors Martin Pateshull and William Raleigh, also known as William de Raley. It cannot be determined whether he disgraced the King or the barons in this affair, but it is speculated that some kind of political intrigue was involved. The practical result was that his major work, De Legibus et Consuetudinibus Angliae ("The Laws and Customs of England"), was left unfinished. Even so, it exists in four large volumes today. He continued to follow the assizes in the southwest until 1267. In the last year of his life he filled another prominent role, as member of a commission of prelates, magnates and justices appointed to hear the complaints of the "disinherited" those who had sided with Simon de Montfort, 6th Earl of Leicester.
Links: a. Second Barons' War b. Somerset c. Simon de Montfort, 6th Earl of Leicester d. Second Barons' War
Example Output: a

Example Input: Question: How many goals did Brandon Saad score during the 2104-15 season? Passage:During the 201415 season, Kane emerged as one of the NHL's leading scorers. He was elected to the 2015 NHL All-Star Game in Columbus, Ohio. He scored 64 points (27 goals and 37 assists) through the regular season. He injured his left clavicle on February 24, 2015, after he was cross-checked into the boards while stumbling towards the ice by Alex Petrovic in a game against the Florida Panthers. Kane underwent surgery and was expected to miss 12 weeks. At the time of his injury, he was leading the NHL in points. However, he recovered earlier than initially projected and returned to the Blackhawks at the start of the 2015 playoffs. Chicago head coach Joel Quenneville moved Kane to the Blackhawks' top line alongside Jonathan Toews and Brandon Saad after the Anaheim Ducks took a 32 game lead in the Western Conference Finals. The trio combined for nine points over the final two games and propelled the Blackhawks to the Stanley Cup Finals. Kane helped the Blackhawks defeat the Tampa Bay Lightning by assisting on Duncan Keith's game-winning goal in Game 6 and scoring an insurance goal for his third Stanley Cup championship in six years. Kane finished the playoffs with 11 goals and 12 assists, tying the Lightning's Tyler Johnson with a playoff-high 23 points.
Links: a. Brandon Saad b. Anaheim Ducks c. 201415 NHL season d. Tampa Bay Lightning
Example Output:
a