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.

Input: Consider Input: Question: How many pieces had Beethoven composed before the one Pinza performed in 1935? Passage:Pinza sang once again under the baton of Toscanini in 1935, this time with the New York Philharmonic Orchestra, as the bass soloist in performances of Beethoven's Missa Solemnis. One of these performances was broadcast by CBS and preserved on transcription discs; this recording has been issued on LPs and CDs. He also sang in Toscanini's February 6, 1938, NBC Symphony Orchestra's broadcast performance of Beethoven's Ninth Symphony. These performances both took place in Carnegie Hall. In March 1942, Pinza was arrested at his home and unjustly detained 3 months on Ellis Island with hundreds of other Italian-Americans who were suspected of supporting the Axis. The incident was extremely traumatic for Pinza, and he suffered from severe depression for years afterward. In October 1947, he performed the role of Méphistophélès in Guonod's Faust opposite his daughter, soprano Claudia Pinza Bozzolla, as Marguerite at the San Francisco Opera.
 Links: a. Symphony No. 9 (Beethoven) b. Missa solemnis (Beethoven) c. Faust (opera) d. San Francisco Opera

Output: b


Input: Consider Input: Question: How many miles long is the river that Silvanus drove the Alamanni tribesmen back from? Passage:Silvanus was born in Gaul, the son of Bonitus, a Laetic Frankish general who had supported Constantine I in the civil war against Licinius. Like so many other Franks of his times, and like his father before him, he was a loyal and thoroughly romanized "barbarian" in the military service of the Empire. By AD 351, he held the rank of tribune and was one of the senior officers who defected to Emperor Constantius II at the Battle of Mursa Major, after initially supporting the usurper Magnentius. An able soldier, Silvanus was eventually promoted to the rank of Magister militum per Gallias, a crucial post, then in AD 352-353, Constantius personally entrusted him with the difficult task of driving the Alamanni tribesmen raiding and looting in Gaul back beyond the Rhine, and restoring the fast eroding Roman authority in the province. This Silvanus fulfilled partly by bribing the Alamanni chieftains with the taxes he had collected, partly by defeating the Alamanni in battle and partly by suppressing the local bagaudae insurrections flaring up again in central and northern Gaul.
 Links: a. Bonitus (magister militum) b. Constantine the Great c. Rhine d. Rhine

Output: c


Input: Consider Input: Question: How old was Bartolome de las Casas during his second Guatemala visit? Passage:On his second visit to Guatemala, in 1537, friar Bartolome de las Casas, O.P. wanted to employ his new method of conversion based on two principles: 1) to preach the Gospel to all men and treat them as equals, and 2) to assert that conversion must be voluntary and based on knowledge and understanding of the Faith. It was important for Las Casas that this method be tested without meddling from secular colonists, so he chose a territory in the heart of Guatemala where there were no previous colonies and where the natives were considered fierce and war-like. Because of the fact that the land had not been possible to conquer by military means, the governor of Guatemala, Alonso de Maldonado, agreed to sign a contract promising that if the venture was successful he would not establish any new encomiendas in the area. Las Casas's group of friars established a Dominican presence in Rabinal, Sacapulas and Cobán, reaching as far as Chahal and including Cubulco. Through the efforts of Las Casas' missionaries the so-called "Land of War" came to be called "Verapaz", "True Peace". Las Casas's strategy was to teach Christian songs to merchant Indian Christians who then ventured into the area. In this way he was successful in converting several native chiefs, among them those of Atitlán and Chichicastenango, and in building several churches in the territory named Alta Verapaz. These congregated a group of Christian Indians in the location of what is now the town of Rabinal. In 1538 Las Casas was recalled from his mission by Bishop Francisco Marroquin who wanted him to go to Mexico and then on to Spain in order to seek more Dominicans to assist in the mission.
 Links: a. Bartolomé de las Casas b. Spain c. Bartolomé de las Casas d. Sacapulas


Output: a