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 founding of the city that the crusaders captured? Passage:The See of Tyre was the most prestigious archbishopric under the authority of the patriarchs of Antioch from the 5th century. The archbishops had more than a dozen suffragans, including the bishops of Acre, Beirut, Jubail, Sidon, Tripoli and Tortosa. The crusaders captured Tortosa (now Tartus in Syria) in 1102, Jubail in 1103, and Tripoli in 1109. In the late 1170s, William of Tyre wrote that Bernard of Valence, the Latin Patriarch of Antioch, had soon appointed Latin bishops to the three bishoprics. Documents written in the early 12th century did not refer to the bishops of the three dioceses, suggesting that the three sees, all located in the newly established crusader County of Tripoli, were actually left vacant. After King Baldwin I of Jerusalem captured Sidon and Beirut in 1110, Ghibbelin of Arles, the Latin Patriarch of Jerusalem, convinced Baldwin I to ask Pope Paschal II to place the two sees and also the bishopric of Acre under the jurisdiction of the patriarchs of Jerusalem. Accepting the king's argumentation, the Pope ruled on 8 June 1111 that the boundaries of the ecclesiastical provinces should follow the political frontiers. Patriarch Bernard protested, but the Pope confirmed his decision, emphasizing his right to alter the boundaries of the patriarchates.
Links: a. Patriarch of Antioch b. Baldwin I of Jerusalem c. Tartus d. William of Tyre
Example Output: c

Example Input: Question: How long after Markos' mission to the Pope did Martin V pass away? Passage:He first appears in Constantinople in 1401, qualified as an oikeios of the emperor. In 1417 he was possibly sent on a diplomatic mission to the Venetians in the Morea. In 1422 and again in 1429 he was sent by Emperor John VIII Palaiologos as an envoy to the Ottoman Sultan Murad II. At the time he had the relatively lowly rank of protovestiarites, but was quickly promoted to protostrator and then to the senior rank of megas stratopedarches, which he held already during his mission in 1430 to Pope Martin V. During his return from the mission to the Pope, on orders from the Emperor, he raised Thomas Palaiologos to the rank of Despot in the Morea. He led two more missions abroad, one in 1433 to Pope Eugene IV, and one in 1438 to Venice.
Links: a. Ottoman Empire b. Constantinople c. Pope Martin V d. John VIII Palaiologos
Example Output: c

Example Input: Question: Who is the leader of Sakhalin? Passage:Koryo-saram is the name which ethnic Koreans in the Post-Soviet states use to refer to themselves. Approximately 500,000 ethnic Koreans reside in the former USSR, primarily in the newly independent states of Central Asia. There are also large Korean communities in southern Russia (around Volgograd), the Caucasus, and southern Ukraine. These communities can be traced back to the Koreans who were living in the Russian Far East during the late 19th century. There is also a separate ethnic Korean community on the island of Sakhalin, typically referred to as Sakhalin Koreans. Some may identify as Koryo-saram, but many do not. Unlike the communities on the Russian mainland, which consist mostly of immigrants from the late 19th and early 20th centuries, the ancestors of the Sakhalin Koreans came as immigrants from Gyeongsang and Jeolla provinces in the late 1930s and early 1940s, forced into service by the Japanese government to work in coal mines in order to fill labour shortages caused by World War II.
Links: a. Russia b. World War II c. Volgograd d. Sakhalin
Example Output:
d