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: What is the name of the person who was most recently given the award Melvill received in 1843? Passage:Melvill van Carnbee traced his descent from an old Scottish family, originally, it is said, of Hungarian extraction. Destined for the navy, in which his grandfather Pieter Melvill van Carnbee (1743-1810) had been admiral, he had a taste for hydrography and cartography as a student in the college of Medemblik, and he showed his capacity as a surveyor on his first voyage to the Dutch Indies, in 1835. In 1839, he was again in the East, and was attached to the hydrographical bureau at Batavia. With the assistance of documents collected by the old East India Company, he completed a map of Java in five sheets, accompanied by sailing directions, in Amsterdam, in 1842. He remained in the East until 1845, collecting materials for a chart of the waters between Sumatra and Borneo, which was two sheets that were published in 1845 and 1846. In his absence, Melvill received the decoration of the Netherlands Lion in 1843, and that of the Legion of Honour in 1849.
 Links: a. Sumatra b. Sumatra c. Order of the Netherlands Lion d. Surveying
Example Output: c

Example Input: Question: How many years after Wish You Were Here was released was The Wall released? Passage:Storm Thorgerson, who had done the majority of album covers for Pink Floyd, did the Echoes art which features recursive windows in an infinite regression as a nod to his own cover for 1969's Ummagumma, and the objects on each landscape refer to the Pink Floyd discography. For instance, there's the man on fire from Wish You Were Here, another wearing the Delicate Sound of Thunder lightbulb suit, dolls of the Atom Heart Mother cow and the Animals pig, a bike and both a brick wall and the hammers from The Wall. Eventually Thorgerson opted to make two images, with another used for the back cover. To create the idea on a photograph, various walls - which had varied measurements and angles to ensure that "nothing seemed to fit other than by eye through the lens." - were built and put in a country landscape in Sussex. Actors, props and fittings were set in and between those walls. The original design was one of two sketches submitted for Dream Theater's 1997 album Falling into Infinity, with the original being framed and hanging in the home of former Dream Theater drummer Mike Portnoy and is pointed out by Portnoy in his Hudson Music instructional drum DVD In Constant Motion.
 Links: a. Wish You Were Here (Pink Floyd album) b. Sussex c. Ummagumma d. Atom Heart Mother
Example Output: a

Example Input: Question: What year was Shaw born? Passage:Businessman Clay Shaw, head of the International Trade Mart in New Orleans, represented the United States on the board of directors for Permindex. On March 1, 1967, Shaw was arrested and charged with conspiring to assassinate President John F. Kennedy by New Orleans District Attorney Jim Garrison. Three days later on March 4, the Italian left-wing newspaper Paese Sera published a story alleging that Shaw was linked to the CIA through his involvement in the Centro Mondiale Commerciale, a subsidiary of Permindex in which Shaw was also said to be a board member. According to Paese Sera, the CMC had been a front organization developed by the CIA for transferring funds to Italy for "illegal political-espionage activities" and had attempted to depose French President Charles de Gaulle in the early 1960s. On March 6, the newspaper printed other allegations about individuals it said were connected to Permindex, including Louis Bloomfield whom it described as "an American agent who now plays the role of a businessman from Canada (who) established secret ties in Rome with Deputies of the Christian Democrats and neo-Fascist parties." The allegations were retold in various newspapers associated with the Communist parties in Italy (l'Unità), France (L'Humanité), and the Soviet Union (Pravda), as well as leftist papers in Canada and Greece, prior to reaching the American press eight weeks later. American journalist Max Holland stated that Paese Sera's allegations connecting Shaw to the CIA eventually led to Garrison implicating the CIA in a conspiracy to assassinate Kennedy.
 Links: a. Clay Shaw b. Front organization c. Clay Shaw d. Clay Shaw
Example Output:
a