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: When did the war end that brought the inhabitants of New Mexico under the governance of the United States? Passage:Hispanos identify strongly with their Spanish heritage and most are also mestizos of mixed Apache, Comanche, Pueblo, Navajo, Native Mexican, and Genízaro ancestry. Exact numbers for the population size of New Mexican Hispanos is difficult, as many also identify with Chicano and Mexican-American movements. For most of its modern history, New Mexico existed on the periphery of the Spanish empire from 1598 until 1821 and later Mexico (1821–1848), but was dominated by Comancheria politically and economically from the 1750s to 1850s. Due to the Comanche, contact with the rest of Spanish America was limited, and New Mexican Spanish developed closer trading links with the Comanche than the rest of New Spain. In the meantime, some Spanish colonists coexisted with and intermarried with Puebloan peoples and Navajos, enemies of the Comanche. New Mexicans of all ethnicities were commonly enslaved by the Comanche and Apache of Apacheria, while Native New Mexicans were commonly enslaved and adopted Spanish language and culture. These Genízaros served as house servants, sheep herders, and in other capacities in New Mexico including what is known today as Southern Colorado well into the 1800s. By the late 18th century, Genízaros and their descendants, often referred to as Coyotes, comprised nearly one-third of the entire population of New Mexico. After the Mexican–American War, New Mexico and all its inhabitants came under the governance of the English-speaking United States, and for the next hundred years, English-speakers increased in number. By the 1980s, more and more Hispanos were using English instead of New Mexican Spanish at home.
 Links: a. Mexican–American War b. New Spain c. Apache d. Genízaro
Example Output: a

Example Input: Question: What countries signed the treaty that acknowledges Ireland's "traditional policy of military neutrality"? Passage:Ireland has been neutral in international relations since the 1930s. The nature of Irish neutrality has varied over time, and has been contested since the 1970s. Historically, the state was a "non-belligerent" in the Second World War (see Irish neutrality during World War II) and has never joined NATO, although during the Cold War it was anti-communist and aloof from the Non-Aligned Movement. The compatibility of neutrality with Ireland's membership of the European Union has been a point of debate in EU treaty referendum campaigns since the 1990s. The Seville Declarations on the Treaty of Nice acknowledge Ireland's "traditional policy of military neutrality", reflecting the narrow formulation of successive Irish governments. Others define Irish neutrality more broadly, as having "a strong normative focus, with a commitment to development, United Nations peacekeeping, human rights and disarmament".
 Links: a. Republic of Ireland b. Seville Declarations on the Treaty of Nice c. Neutral country d. Seville Declarations on the Treaty of Nice
Example Output: b

Example Input: Question: Who founded the company that was announced as collaborating with tri-Ace to create Exist Archive in July of 2015? Passage:The game was first announced in July 2015, as a collaboration between Spike Chunsoft and tri-Ace in a fourteen-page article in Weekly Famitsu. The game will be developed by much of the same tri-Ace staff that had worked on the first Valkyrie Profile game, with assistance from Spike Chunsoft staff as well. Other key staff for the game include character designer Mino Taro of Konamis Love Plus series, and music composer Motoi Sakuraba, composer for tri-Ace's Valkyrie Profile and Star Ocean series. A trailer for the game was shown at the Tokyo Game Show in September 2015. Trailers for each of the game's characters were released over time through Famitsus YouTube channel. The game was first announced to be released on November 26, 2015, before being delayed to its final release date, December 17, 2015. Shortly after the game's Japanese release, Spike Chunsoft announced that there would be downloadable content collaborations some of tri-Ace's other games, including Valkyrie Profile and Star Ocean 5 games. The collaborations, released in March 2016, consisted of character costumes based on character's from the two aforementioned titles, along with a costume to dress up as Monokuma, the primary antagonist from Spike Chunsoft's Danganronpa series of video games.
 Links: a. Star Ocean: Integrity and Faithlessness b. Spike Chunsoft c. Downloadable content d. Star Ocean: Integrity and Faithlessness
Example Output:
b