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.

Input: Consider 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

Output: a


Input: Consider Input: Question: Which of the German university towns that Alberico went to is the largest? Passage:After his graduation, he was elected as the chief judge of Ascoli, but he then settled in his native town, where he filled various responsible offices. Both father and son belonged to a confraternity suspected of meeting for the discussion of opinions hostile to the Roman church. The Inquisition was upon the track of the heretics, and Gentili, together with his father and one of his brothers, Scipione Gentili, were forced to leave Italy because of their Protestant beliefs. The three first went to Ljubljana (German: Laibach), now in Slovenia, the capital of the duchy of Carniola. From there, Alberico went on to the German university towns of Tübingen and Heidelberg. At their first halting place, Ljubljana, Matteo, doubtless through the influence of his brother-in-law, Nicolo Petrelli, a jurist high in favour with the court, was appointed chief physician for the duchy of Carniola. In the meantime, the papal authorities had excommunicated the fugitives and soon procured their expulsion from Austrian territory. Early in 1580, Alberico set out for England, preceded by a reputation that procured him offers of professorships at Heidelberg and at Tübingen, where Scipio was left to commence his university studies. Alberico reached London in August, with introductions to Giovanni Battista Castiglione, the Italian tutor to Queen Elizabeth I. Gentili soon became acquainted with Dr Tobia Matthew, the Archbishop of York. On 14 January 1581, Gentili was accordingly incorporated from Perugia as a D.C.L. giving Gentili the right of teaching law, which he first exercised in St John's College, Oxford. Subsequently, Gentili was appointed as the Regius professor of civil law at Oxford University by the Chancellor of Oxford University, Robert Dudley, 1st Earl of Leicester. He was commissioned to prepare a revised version of the statutory laws of his home town, a task which he completed in 1577. After a short stay in Wittenberg, Germany, he returned to Oxford.
 Links: a. Scipione Gentili b. Heidelberg c. Robert Dudley, 1st Earl of Leicester d. Archbishop of York

Output: b


Input: Consider Input: Question: What decade did the Kurdish-Turkish conflict begin? Passage:Turkey had been fighting PKK and other groups in southeastern and eastern Turkey for several decades. The Kurdish–Turkish conflict is estimated to have cost 40,000 lives. The Turkish government has publicly stated that it does not recognize a difference between the Syrian YPG forces and PKK, and says both are terrorist organizations. While the PKK has been designated as a Foreign Terrorist Organization by the United States, the United States' position on the YPG is that it is not a terrorist organization, a stance that has generated much conflict between the two NATO allies. Despite this, the CIA named the PYD as the "Syrian wing" of the PKK in its World Factbook on 23 January 2018. On 14 February, Director of National Intelligence described YPG as the Syrian wing of PKK in its new report.
 Links: a. Kurdistan Workers' Party b. Kurdish–Turkish conflict (1978–present) c. The World Factbook d. Kurdish–Turkish conflict (1978–present)


Output: b