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 military force that Mello achieved the rank of Colonel at age 35 founded? Passage:During the same period, he also served as Chief of Public Health for Portuguese India. He undertook a postgraduate course in parasitology in Kaiser Willhelm Institute fuer Biologie, Berlin, and at the Max Planck Institute, Potsdam, Germany from 192223. In 1922, at the age of 35, Mello became a Colonel in the Portuguese Army Medical Corps, achieving the highest rank in the medical military hierarchy of that time, exclusively through merits in the medical campaigns on Public Health which he carried out in Goa, Daman, Diu, and in Angola. Mello was the head of a Portuguese delegation to the World Leprosy Conference in Cuba and is known to have attended at least 40 World Conferences, including the All India Sanitary Conference in Lucknow (1914) and the Third Entomological Meeting in Lucknow (1914) where, at the invitation of the Governor-General of India, he lectured on medical mycology. His researches in tropical medicine brought him international fame and recognition as a world-renowned expert on the subject. Mello published more than 200 research papers on bacteriology in Portuguese, French and English journals. He founded the following medical journals in Goa, Boletim Geral de Medicina, Arquivos Indo-Portugueses de Medicina e Historia Natural, and Arquivos da Escola MedicoCirurgica de Nova Goa. His work in French entitled, A la veille du Centenaire (On the eve of the Centenary) elaborated in great detail the contributions of Goa Medical College during the first hundred years of its establishment. Separate from his medical career, Mello also authored a book in 1946 on the Bengali poet, Rabindranath Tagore entitled O Cantico da Vida na Poesia Tagoreana (The song of life in the poetry of Tagore).
Links: a. Rabindranath Tagore b. Portuguese Army c. Daman, India d. Governor-General of India
Example Output: b

Example Input: Question: Who was the leader of Solidarity in 1991? Passage:The 1991 Polish parliamentary election was held on 27 October 1991 to elect deputies to both houses of the National Assembly. The 1991 election was notable on several counts. It was the first parliamentary election to be held since the formation of the Third Republic, the first entirely free and competitive legislative election since the fall of communism, the first completely free legislative election of any sort since 1928, and only the fifth completely free election in all of Polish history. Due to the collapse of the Solidarity movement's political wing, the 1991 election saw deep political fragmentation, with a multitude of new parties and alliances emerging in its wake. Low voting thresholds within individual constituencies, along with a five percent national threshold allocated to a small portion of the Sejm, additionally contributed to party fragmentation. As a result, 29 political parties gained entry into the Sejm and 22 in the Senate, with no party holding a decisive majority. Two months of intense coalition negotiations followed, with Jan Olszewski of the Centre Agreement forming a minority government along with the Christian National Union, remnants of the broader Center Civic Alliance, and the Peasants' Agreement, with conditional support from Polish People's Party, Solidarity and other minor parties.
Links: a. Solidarity (Polish trade union) b. Solidarity (Polish trade union) c. Jan Olszewski d. Centre Agreement
Example Output: a

Example Input: Question: Did Jackson or Banks emerge victories in the Battle that took place on May 23rd? Passage:Banks's division technically belonged to George McClellan despite serving as an independent command in the Shenandoah Valley. On March 14, 1862, President Lincoln issued an executive order forming all troops in McClellan's department into corps. Banks thus became a corps commander, in charge of his own former division, now commanded by Brig. Gen Alpheus Williams and the division of Brig. Gen James Shields, which was added to Banks's command. After Stonewall Jackson was turned back at the First Battle of Kernstown on March 23, Banks was instead ordered to pursue Jackson up the valley, to prevent him from reinforcing the defenses of Richmond. When Banks's men reached the southern Valley at the end of a difficult supply line, the president recalled them to Strasburg, at the northern end. Jackson then marched rapidly down the adjacent Luray Valley, and encountered some of Banks' forces in the Battle of Front Royal on May 23. This prompted Banks to withdraw to Winchester, where Jackson again attacked on May 25. The Union forces were poorly arrayed in defense, and retreated in disorder across the Potomac River and back into Maryland. An attempt to capture Jackson's forces in a pincer movement (with forces led by John Fremont and Irvin McDowell) failed, and Jackson was able to reinforce Richmond. Banks was criticized for mishandling his troops and performing inadequate reconnaissance in the campaign, while his political allies sought to pin the blame for the debacle on the War Department.
Links: a. Richmond, Virginia b. Irvin McDowell c. First Battle of Winchester d. Battle of Front Royal
Example Output:
d