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: What is the capital city of the country where Orson K. Miller claims to have found the Amanita abrupta? Passage:The fruit bodies of A. abrupta grow on the ground, typically solitary, in mixed conifer and deciduous forests, usually during autumn. The frequency with which fruit bodies appear depends on several factors, such as season, location, temperature, and rainfall. The mushroom has been described as common in the Southeastern United States; in Texas, it has been called both infrequent, and common in the Big Thicket National Preserve. Like most other Amanita species, A. abrupta is thought to form mycorrhizal relationships with trees. This is a mutually beneficial relationship where the hyphae of the fungus grow around the roots of trees, enabling the fungus to receive moisture, protection and nutritive byproducts of the tree, and affording the tree greater access to soil nutrients. Amanita abrupta is widely distributed throughout eastern North America, where it has been found as far north as Quebec, Canada, and as far south as Mexico. Orson K. Miller claims to have found it in the Dominican Republic where it appeared to be growing in a mycorrizhal association with pine trees. Kuo also mentions a mycorrhizal relationship with both hardwoods and conifers, while Tulloss lists additional preferred tree hosts such as beech, birch, fir, tsuga, oak, and poplar. However, A. abrupta has been shown experimentally to not form mycorrhizae with Virginia Pine.
 Links: a. Pine b. Dominican Republic c. Oak d. Dominican Republic
Example Output: b

Example Input: Question: How many years did the owner of the private observatory live? Passage:It would seem that Gill's interests lay elsewhere since after a few years he sold the business, and then spent time equipping Lord Lindsay's private observatory at Dun Echt, Aberdeenshire. In 1874, Gill joined the expedition to Mauritius to observe the transit of Venus. Three years later he went to Ascension Island to observe a near approach of Mars and to calculate its distance. While carrying out these laborious calculations, he was notified of his appointment to the Cape Observatory, which, over the following 27 years he was to refurbish completely, turning it into a first-rate institution. Gill was a meticulous observer and had a flair for getting the best out of his instruments. His solar parallax observations with a heliometer and his calculations of distances to the nearer stars, are testimony to his outstanding work. He recruited Robert Innes to the Cape Observatory.
 Links: a. South African Astronomical Observatory b. Aberdeenshire (historic) c. James Lindsay, 26th Earl of Crawford d. South African Astronomical Observatory
Example Output: c

Example Input: Question: How long had Fernando Carvalho been vice president of the Los Angeles Galaxy the year they made a $10 million offer to D'Alesandro? Passage:On 13 December 2008 it was reported on ESPN Deportes that the Los Angeles Galaxy had made a $10 million offer to Internacional for D'Alesandro but was declined. Their vice president Fernando Carvalho was quoted; "The offer came from the Los Angeles Galaxy of the United States. I didn't even want to listen to the details. The offer was for more money than we paid for D'Alessandro, who arrived here for five million euro, but we want to keep the Argentinian." D'Alessandro has become one of Internacional's most idolized players of all time along the likes of Falcão, Valdomiro, and Fernandão. In 2008, he was part of Inter's Sulamericana Championship. In 2009 Internacional finished in second place in both the Brasileirão and Copa do Brasil. In 2010, D'Alessandro led Internacional to their second Libertadores Championship, and was elected the best player in South America for that year; in the 2010 FIFA Club World Cup, he also helped Internacional to a third-place finish, and was awarded the Bronze Ball as the tournament's third best player. In 2011 D'Alessadro had personally an even better year, but Internacional only managed to win the State Gaucho Championship. 2012 was a bad year for both Internacional and D'Alessandro. Furthermore, rumours of him leaving to play in China caused a major distraction; after long drawn out drama he stayed but soon was injured. In 2013 his game improved again, and while Inter only won the State Championship, he was praised as the only positive factor of the team that year. 2014 started well; D'Alessandro continued to play well and led Inter to their 4th straight Gaucho Championship.
 Links: a. 2008 Copa Sudamericana b. 2011 Campeonato Gaúcho c. Fernando Chagas Carvalho Neto d. Fernando Chagas Carvalho Neto
Example Output:
c

