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: In what current day city would the Church of the Holy Apostles be located in? Passage:The facts regarding Constantine's life are confused and subject to conjecture. It is known that at the time of Emperor Leo VI the Wise (r. 886–912), he restored a monastery near the Church of the Holy Apostles, which is nowadays identified with the Fenari Isa Mosque on account of a partial inscription commemorating its dedication to the Theotokos. The date of the inauguration is traditionally placed in 907/908. Constantine Lips also participated in the failed coup of the prominent general Constantine Doukas against the infant Constantine VII Porphyrogennetos (r. 913–959) in July 913, after the death of Leo's brother and successor Alexander (r. 912–913). In its wake, several nobles who had been or were suspected of being involved in the coup were executed, while others fled the city, amongst them Constantine Lips. On August 20, 917, he fell at the Battle of Acheloos, fighting against the Bulgarian forces under Simeon I.
 Links: a. Church of the Holy Apostles b. Theotokos c. Constantine Doukas (usurper) d. Inauguration

Output: a


Input: Consider Input: Question: Who was the head coach for Ajax Youth Academy when Jozefzoon joined? Passage:A Winger and attacking midfielder, Jozefzoon began his career with spells at CTO '70 and AFC. He joined the Ajax Youth Academy in 2006 and signed a three-year professional contract in June 2008. Jozefzoon won his maiden call into the first team squad for the opening match of the 2010–11 Eredivisie season versus FC Groningen and remained an unused substitute during the 2–2 draw. He made his senior debut six days later, replacing Urby Emanuelson at half time during a 4–2 win over SBV Vitesse. He scored his only goal for the club in a 5–0 KNVB Becker third round win over MVV Maastricht on 22 September 2010. After five appearances during the 2010–11 season, Jozefzoon signed a one-year contract extension in June 2011, but spent the 2011–12 season away on loan and was released at the end of the season.
 Links: a. SBV Vitesse b. SBV Vitesse c. Ajax Youth Academy d. Ajax Youth Academy

Output: c


Input: Consider Input: Question: What is the tributary of the Croton River? Passage: the 1840s and 1850s the largest cities in the U.S. built pipelines to supply drinking water from rivers or lakes. However, the drinking water was initially not treated, since the link between waterborne pathogens and diseases was not yet well known. In 1842 New York City was one of the first cities in the U.S. to tap water resources outside the city limits. It dammed the Croton River in Westchester County, New York, and built an aqueduct from the reservoir to the city. Also in 1842, construction was completed on Chicago's first water works, with water mains made of cedar and a water intake located about into Lake Michigan. In 1848, Boston began construction of a water transmission system. A tributary of the Sudbury River was impounded creating Lake Cochituate, from where the Cochituate Aqueduct transported water to the Brookline Reservoir that fed the city's distribution system. In 1853 Washington, D.C. followed suit by beginning the construction of the Washington Aqueduct to provide water from the Great Falls on the Potomac River.
 Links: a. Lake Michigan b. Washington Aqueduct c. Lake Cochituate d. Croton River


Output: d