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 old was Walter's oldest son when Walters passed away? Passage:Walter was born in Kansas City, Missouri, United States, in 1910. His ancestry was German/British on his father's side, and American/British on his mother's side. He was brought to England in 1915, and educated at Westminster School and afterwards in King's College, Cambridge, in 1931. He failed to obtain a research fellowship in Cambridge and so turned to doing basic and applied neurophysiological research in hospitals, in London, from 1935 to 1939 and then at the Burden Neurological Institute in Bristol, from 1939 to 1970. He also carried out research work in the United States, in the Soviet Union and in various other places in Europe. He married twice, had two sons from his first marriage, and one from the second. According to his eldest son, Nicolas Walter, "he was politically on the left, a communist fellow-traveller before the Second World War and an anarchist sympathiser after it." Throughout his life he was a pioneer in the field of cybernetics. In 1970, he suffered a brain injury in a motor scooter accident. He never fully recovered and died seven years later, on May 6, 1977.
Links: a. Cybernetics b. University of Cambridge c. Nicolas Walter d. Westminster School
Example Output: c

Example Input: Question: Who owns the tallest building in Dubai? Passage:Dubai, the largest city in the United Arab Emirates, is home to many modern high-rises, 108of which stand taller than . The tallest building in Dubai is the Burj Khalifa, which rises and contains 163 floors. The tower has stood as both the tallest building in the world and the tallest man-made structure of any kind in the world since its completion in January 2010. The second-tallest building in Dubai is the Marina 101, which also stands as the world's second tallest residential skyscraper. The skyscrapers of Dubai are, for the most part, clustered in three different locations. The land along E 11 Road was the first to develop, followed by the Dubai Marina neighborhood and the Business Bay district.
Links: a. List of tallest buildings b. Burj Khalifa c. Burj Khalifa d. Burj Khalifa
Example Output: b

Example Input: Question: What age was Lehmann when she first play Ariadne? Passage:In 1926, the opera was first presented at the Salzburg Festival, staged by Lothar Wallerstein in Viennese settings, twice conducted by Clemens Krauss and once by Richard Strauss himself. Lotte Lehmann was Salzburg's first Ariadne. Wallerstein was also the stage director of the second Viennese production in 1935, with settings by Oskar Strnad and costumes by Ladislaus Czettel. Josef Krips conducted. There were 38 performances until September 1943. Three months later a new production by Heinz Arnold was presented, with settings by Wilhelm Reinking and conducted by Karl Bohm. The cast featured Maria Reining as Ariadne, Max Lorenz as Bacchus, Alda Noni as Zerbinetta, Irmgard Seefried as composer, Paul Schoffler as Musiklehrer, Erich Kunz as Harlekin and Emmy Loose as Najade. Due to the war this production could only be shown seven times.
Links: a. Alda Noni b. Irmgard Seefried c. Josef Krips d. Lotte Lehmann
Example Output:
d