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 long had Juan Carlos Onganía been leading Argentina by the year La balsa was written? Passage:"La balsa" (; Spanish for "the raft") is the debut single by the Argentine band Los Gatos, released on July 3, 1967 on Vik, a subsidiary of RCA Victor. Formed in 1967 after the disbandment of Los Gatos Salvajes, Los Gatos were the house band of the bar La Cueva, which became a popular meeting place for rock enthusiasts and the birthplace of Argentine rock—known locally as rock nacional (Spanish for "national rock"). During the mid-to-late 1960s, Buenos Aires was experiencing a cultural blossoming characterized by innovations in modern art, literature and cinema, largely driven by a burgeoning youth subculture that adhered to the countercultural phenomenon of the decade. The underground had its center in La Cueva, Plaza Francia and the Torcuato di Tella Institute, and identified with British Invasion music and the sexual revolution. "La balsa" was written by Litto Nebbia—lead vocalist of the band—and Tanguito (credited as Ramsés) on May 2, 1967, in the men's toilet of La Perla de Once, another bar frequented by the group. At the time, Argentina was under a military dictatorship led by Juan Carlos Onganía, which regularly imprisoned and persecuted these young bohemians.
 Links: a. British Invasion b. Juan Carlos Onganía c. Argentine rock d. Tanguito
Example Output: b

Example Input: Question: How many years after the Clairvaux was found, was the Margam Abbey founded? Passage:The abbey was founded in 1147 as a daughter house of Clairvaux by Robert, Earl of Gloucester, and was dedicated to the Blessed Virgin Mary. Early Christian crosses found in the close vicinity and conserved in the nearby Margam Stones Museum suggest the existence of an earlier Celtic monastic community. The founding abbot was William of Clairvaux. The third abbot, Conan, enjoyed the praise of Giraldus Cambrensis, whom he appears to have entertained prior to his official visit with Baldwin of Forde, Archbishop of Canterbury, to preach the Crusade in 1188. Conan (or Cunan) contributed to Patristic literature, as he is credited with the capitula or chapter-headings prefixing each section of St. Bernard's Sermons on the Song of Songs, one of the works for which that author was titled a Doctor of the Church.
 Links: a. Clairvaux Abbey b. Clairvaux Abbey c. Pilcrow d. Pilcrow
Example Output: a

Example Input: Question: In what year was the person born who restored St. Mary's from 1869-1874? Passage:St Mary's stands on the site of a convent established by Domneva in 664–73. This was destroyed by the Danes, and rebuilt by Emma, wife of King Canute. Following the Norman conquest the church was rebuilt again. At this stage it consisted of a nave with north and south aisles, a chancel, a central tower and, possibly, transepts. The chancel was rebuilt in about 1200. The church was damaged by the French in 1217 and again in 1457, and by an earthquake in 1578. In 1667 the central tower collapsed, destroying the nave arcades. It was rebuilt again, with a wide roof covering the nave and the south aisle. In 1714 a belfry was built on the porch, and galleries were added in the middle of the 18th century. The church was restored in 1869–74 by Joseph Clarke.
 Links: a. Transept b. Joseph Clarke (architect) c. Domne Eafe d. Chancel
Example Output:
b