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 was the organization founded to which Cross received appointment as a chevalier? Passage:Colonel Marie Augstin Gaston Cros (known as Gaston Cros) (6 October 1861 – 10 May 1915) was a French army officer and archaeologist. He was born in Alsace and was displaced when that territory was incorporated into the German Empire. He joined the French Army as a lieutenant and saw action in Tonkin before spending several years surveying in Tunisia, receiving the honours of membership of Vietnamese and Tunisian orders and appointment as a chevalier of the Legion of Honour. In 1901 Cros was appointed head of the French archaeological expedition to Girsu, Iraq to continue the work of Ernest de Sarzec. His work over the next five years included the tracing of the thick city wall and for his work there received a letter of commendation from Gaston Doumergue, the Minister of Fine Arts, and the award of the Golden Palms of the Ordre des Palmes Académiques. Promoted to lieutenant-colonel, Cros served in the French protectorate of Morocco from 1913, seeing action in the Zaian War.
 Links: a. Tonkin b. Zaian War c. Ernest de Sarzec d. Legion of Honour
Example Output: d

Example Input: Question: How many people were in attendance at the University of Colorado at Boulder the year that J.D. Brookhart was hired as passing game coordinator, tight ends coach, and special teams coordinator? Passage:Joseph Daniel Brookhart (born October 17, 1964) is an American football coach and former player. He was most recently an assistant coach at the University of Colorado at Boulder, where he was hired as passing game coordinator, tight ends coach, and special teams coordinator on Jon Embree's staff in December 2010. Brookhart was the head coach at the University of Akron from 2004 to 2009, compiling a record of 30–42. His Akron Zips won the Mid-American Conference (MAC) in 2005, and he was honored as the MAC Coach of the Year the previous season. Brookhart played college football at Brigham Young University as a freshman walk-on before transferring to Colorado State University. He has also served as an assistant coach at the University of Pittsburgh and with the Denver Broncos of the National Football League (NFL).
 Links: a. Mid-American Conference football individual awards b. University of Pittsburgh c. University of Colorado Boulder d. American football
Example Output: c

Example Input: Question: What is the difference in age between Campbell and his brother-in-law? Passage:He was born at Bedford Square, London, January 4, 1809. He grew up in an affluent family, the fifth of the six children born to Duncan Campbell (d.1815), who had made a fortune in the West Indies, and Harriet (d.1817), daughter of Robert Young of Auchenshcoch. He was the grandson of Alexander Campbell (1710-1760), 11th Laird of Inverawe, Argyll, descended from Archibald Campbell of Inverawe. His brother, Colonel James Campbell, built New Inverawe, today known as Ardanaiseig Hotel. He was a brother-in-law of Sir Alexander Spearman 1st Bt., of Hanwell, and his sister-in-law was a niece of Lt.-General Sir James Campbell, 1st Bt., of Inverneill. In 1832, he graduated from the Royal Military Academy Sandhurst and was appointed Captain of the Royal Scots and aide-de-camp to Lieutenant-General Campbell. He transferred to the 1st The Royal Dragoons and then joined the 7th Queen's Own Hussars, serving in the Near East.
 Links: a. Clan Campbell b. Aide-de-camp c. Spearman baronets d. Bedford Square
Example Output:
c