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 days did the battle the Baron was killed in last? Passage:While they were travelling to Europe in 1914, the First World War broke out and the ship carrying Von Wolf and his wife was diverted to Rio de Janeiro. Jayta Humphreys had retained her American citizenship and found passage to Europe on a Dutch ship; legend has it the Baron had to travel disguised as a woman. On arrival in Europe the Baron rejoined the German army, and was killed at the Battle of the Somme in 1916, just two weeks after signing up. His wife could not bring herself to return to Namibia alone and never again laid claim to the majestic castle. She stayed on the coast of the Tegernmeer in Bavaria (since her stepfather had been appointed consul general in Munich), before settling in the late 1930s in Zurich, where she met and married Erich Schlemmer, the consul general of Siam. After the Von Wolfs left South Africa, their friend Max Count von Lüttichau was given executorship of the farm, but it declared bankruptcy shortly after World War I, and since the South African government paid no compensation for this or several wartime raids, the house was sold for £7,500 to the Swedish Murrmann family. The new owner died shortly after his arrival and his son was killed in World War II, following which the castle was sold for 25,000 pounds to the private company Duwisib Pty Ltd and the rest of the land was divided and sold off. Jayta returned to the US to stay with her parents in Summit, New Jersey. Several changes in ownership later, the castle was acquired by the government in 1979 and extensively refurbished in 1991.
 Links: a. Rio de Janeiro b. Europe c. Europe d. Battle of the Somme
Example Output: d

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 long has the location at the fish's southernmost range been a country? Passage:The cocinero (Caranx vinctus), also known as the barred jack and striped jack, is a species of small marine fish classified in the jack family, Carangidae. The cocinero is distributed through the tropical eastern Pacific Ocean, ranging along the west American coastline from Baja California in the north to Peru in the south. It is a pelagic species, inhabiting the upper water column in both coastal and offshore oceanic waters, occasionally making its way into estuaries. The species may be identified by its colouration, having 8 or 9 incomplete dark vertical stripes on its sides, with scute and gill raker counts also diagnostic. It is small compared to most other species of Caranx, reaching a length of 37 cm in total. The cocinero is a predatory fish, taking small fishes, crustaceans, and various benthic invertebrates in shallower waters. Little is known of the species' reproductive habits. The cocinero is of moderate importance to fisheries along the west coast of South America, and the species has been used in aquaculture trials. It is taken by various netting methods and by spear, and is sold fresh, dried, and salted at market.
 Links: a. Gill raker b. Shore c. Peru d. Aquaculture
Example Output:
c