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 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: When was the university founded that Van Houwelingen applied to in June 1962? Passage:Van Houwelingen applied at the Utrecht University in June 1962 majoring in Chemistry and obtaining an Bachelor of Science degree in July 1964. Van Houwelingen served in the Royal Netherlands Army as a second lieutenant from November 1964 until November 1966. Van Houwelingen worked as a chemist and researcher in the private sector from November 1962 until March 1973. Van Houwelingen served on the Municipal Council of Leerdam from April 1968 until June 1974 and served on the Provincial-Council of Utrecht from June 1970 until June 1974. Van Houwelingen became a Member of the House of Representatives after the resignation of Barend Biesheuvel, taking office on 7 March 1973. After the election of 1977 the Christian Democratic Appeal and the People's Party for Freedom and Democracy (VVD) formed the Cabinet Van Agt-Wiegel, Van Houwelingen and several Christian Democratic Appeal Members of the House of Representatives were critical on the coalition agreement and formed an informal caucus in their own parliamentary group called the  that followed the cabinet critically throughout the entire period. After the election of 1981 Van Houwelingen was appointed as State Secretary for Defence in the Cabinet Van Agt II, taking office on 14 September 1981. The Cabinet Van Agt II fell just seven months into its term on 12 May 1982 and continued to serve in a demissionary capacity until it was replaced by the caretaker Cabinet Van Agt III with Van Houwelingen continuing as State Secretary for Defence, taking office on 29 May 1982. After the election of 1982 Van Houwelingen returned as a Member of the House of Representatives, taking office on 16 September 1982. Following the cabinet formation of 1982 Van Houwelingen continued as State Secretary for Defence in the Cabinet Lubbers I, taking office on 4 November 1982. After the election of 1986 Van Houwelingen again returned as a Member of the House of Representatives, taking office on 3 June 1986. Following the cabinet formation of 1986 Van Houwelingen remained as State Secretary for Defence in the Cabinet Lubbers II, taking office on 14 July 1986. After the election of 1989 Van Houwelingen once again returned as a Member of the House of Representatives, taking office on 14 September 1989. Following the cabinet formation of 1989 Van Houwelingen was not giving a cabinet post in the new cabinet, the Cabinet Lubbers II was replaced by the Cabinet Lubbers III on 7 November 1989 and he continued to serve in the House of Representatives as a frontbencher chairing several . In December 1993 Van Houwelingen announced that he wouldn't not stand for the election of 1994 and continued to serve until the end of the parliamentary term on 17 May 1994. In May 1994 Van Houwelingen was nominated as Mayor of Haarlemmermeer, serving from 1 June 1994 until 1 January 2003.
 Links: a. Utrecht (province) b. Haarlemmermeer c. List of Ministers of Defence of the Netherlands d. Utrecht University
Example Output: d

Example Input: Question: When was the manor that Airey discovered with Arnold Wilkins built? Passage:Airey was born in Oldham, Lancashire on 25 August 1894. He joined Robert Watson-Watt in 1924, and was an original member of the radar team, responsible for masts and support equipment. He was Senior Technical Officer at Telecommunications Research Establishment. Alongside Arnold Wilkins, Airey is credited with having discovered Bawdsey Manor, Ordfordnessas a site for the Air Ministry department that was significant in the history of radar. In his book "Three Steps to Victory" Robert Watson-Watt proclaims Joe Airey's greatest constructional achievement as the installation of a mast atop the Great Pyramid at Cheops. During World War I, Airey was a member of the Dunsterforce in the Persia and the Middle East. By the time of his retirement, he was Station Engineer at the Royal Radar Establishment. He was appointed a Member of the Order of the British Empire (MBE) for his services by King George VI in his Birthday Honours on 14 June 1945. Airey died in Poole Dorset on 10 February 1976.
 Links: a. Royal Radar Establishment b. Bawdsey Manor c. Poole d. Arnold Wilkins
Example Output:
b