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: Between the first president and the first vice president of Colombia, who was older? Passage:The Office of the Presidency goes back to the Congress of Angostura. This quasi-constituent assembly was formed to lay the ground work for a self-ruled governing administration after independence. The Constituent Assembly was formed by regional leaders that represented areas under rebel control; these areas did not include parts of what is now Colombia, as those areas were still under Spanish control, but aimed to legislate on its behalf. Congress elected an interim-executive officer and vested this figure with the title of President. Chosen to be first President of Colombia, was General Simón Bolívar y Palacios, leader of the revolutionary forces, who up to that point was titled "Supreme Chief" for his role in the revolution. The following day, Congress elected Francisco Antonio Zea Díaz, first Vice President of Colombia. Bolívar was subsequently re-elected interim President by the Angostura Assembly on after Colombia was conquered following the Battle of Boyacá, and elected again in 1821 in a permanent interim basis, pending national elections, by the Congress of Cúcuta, another constituent assembly mandated by the Angostura Assembly, and this time with elected officials representing the Colombian territories, during this time, and until 1826, the executive power was entrusted to the Vice President Francisco de Paula Santander y Omaña, while Bolívar was away in battle fighting to liberate Spanish colonies in Bolivia, and Peru. Bolívar was formally elected in a national election in 1826 for a period of four years, but on 27 August 1828, Bolívar declared martial law and assumed dictatorship style powers after the Congress of Ocaña failed to pass a new constitution. Bolívar eventually relinquished power in 1830, and Congress elected Joaquín de Mosquera y Arboleda as his successor, but was shortly deposed by General Rafael Urdaneta y Faría who hoped Bolívar would once again re-take power, but Bolívar not only declined the Presidency, but also shortly died, leaving Urdaneta with no mandate for power. Urdaneta ceded executive-power to the Vice President Domingo Caycedo y Sanz de Santamaría, as Congress had impeached Mosquera for his failure to prevent the coup; during this time, and until 1832 the Presidency remained vacant as there was no law for succession of power. In 1832, former Vice President Santander was elected by Congress as President of Gran Colombia, and it would be the last, since the territories of Venezuela and Ecuador broke away, which prompted the drafting of a new constitution.
 Links: a. Simón Bolívar b. Constituent assembly c. Congress of Angostura d. Battle of Boyacá
Example Output: a

Example Input: Question: Where was the Hudson's Bay Company headquartered when it controlled the Vancouver Island area? Passage:The Colony of Vancouver Island had been created in 1849 to bolster British claims to the whole island and the adjacent Gulf Islands, and to provide a North Pacific home port for the Royal Navy at Esquimalt. By the mid-1850s, the Island Colony's non-indigenous population was around 800 people; a mix of mostly British, French-Canadian, Metis, Hawaiians, but with handfuls of Iroquoians and Cree in the employ of the fur company, and a few Belgian and French Oblate priests (thousands of First Nations died due to the smallpox epidemic). Three years earlier, the Treaty of Washington had established the boundary between British North America and the United States of America west of the Rocky Mountains along the 49th parallel. The mainland area of present-day British Columbia, Canada was an unorganised territory under British sovereignty until 1858. The region was under the de facto administration of the Hudson's Bay Company, and its regional chief executive, James Douglas, who also happened to be Governor of Vancouver Island. The region was informally given the name New Caledonia, after the fur-trading district which covered the central and northern interior of the mainland west of the Rockies.
 Links: a. Gulf Islands b. Hudson's Bay Company c. Colony of Vancouver Island d. Rocky Mountains
Example Output: b

Example Input: Question: Of the types of math Hirschfeld in 1979 considered necessary to learn before reading his work on Galois geometry, which is the oldest mathematical discipline? Passage:In 1979 Hirschfeld published the first of a trilogy on Galois geometry, pegged at a level depending only on "the group theory and linear algebra taught in a first degree course, as well as a little projective geometry, and a very little algebraic geometry." When q is a prime power then there is a finite field GF(q) with q elements called a Galois field. A vector space over GF(q) of n + 1 dimensions produces an n-dimensional Galois geometry PG(n,q) with its subspaces: one-dimensional subspaces are the points of the Galois geometry and two-dimensional subspaces are the lines. Non-singular linear transformations of the vector space provide motions of PG(n,q). The first book (1979) covered PG(1,q) and PG(2,q). The second book addressed PG(3,q) and the third PG(n,q). Chapters are numbered sequentially through the trilogy: 14 in the first book, 15 to 21 in the second, and 22 to 27 in the third. Finite geometry has contributed to coding theory, such as the Goppa code, so the field is supported by computer science. In the preface of the 1991 text Hirschfeld summarizes the status of Galois geometry, mentioning maximum distance separable code, mathematics journals publishing finite geometry, and conferences on combinatorics featuring Galois geometry. Colleague Joseph A. Thas is coauthor of General Galois Geometries on PG(n,q) where n ≥ 4.
 Links: a. Prime power b. Group theory c. Finite field d. Finite field
Example Output:
b