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: Who other than Woldenga has been awarded the Knights cross of the Iron Cross? Passage:Woldenga's career started as a captain in the merchant marine. He started his flight training in 1928 and worked as chief pilot for the FVK Warnemünde. He transferred to the newly emerging Luftwaffe, taking command as Gruppenkommandeur of the I./Jagdgeschwader 131 (JG 131) — later renamed to I./Jagdgeschwader 1 (JG 1) — on 1 April 1937. With this unit he participated in the invasion of Poland in 1939. He surrender command of the Gruppe on 1 February 1940 and was transferred to the Reichsluftfahrtministerium. He briefly led Jagdgeschwader 27 (JG 27) on the Channel Front from 11 October to 22 October 1940 before he was made Geschwaderkommodore of Jagdgeschwader 77 (JG 77). Under this command, JG 77 participated in the Balkans Campaign and invasion of Crete. JG 77 claimed 50 aerial victories. Woldenga received the Knight's Cross of the Iron Cross. He commanded of JG 27 on 21 June 1941 during the invasion of the Soviet Union and claimed 4 aerial victories. He relocated the Geschwaderstab to North Africa in December 1941. He was appointed Fliegerführer Balkan on 10 June 1942. His last service position of the war was commander of the Luftkriegschule 10 in Fürstenwalde near Berlin. He is credited with three aerial victories of which two were claimed on the Eastern Front.
 Links: a. Knight's Cross of the Iron Cross b. Fürstenwalde c. Fürstenwalde d. Jagdgeschwader 77
Example Output: a

Example Input: Question: What country was the French fleet at when Osborn blockaded La Clue from joining the rest of the French fleet? Passage:By October 1757 Rowley had been given the task of commissioning the 60-gun fourth-rate . Once launched she joined Admiral Henry Osborn’s fleet of 14 ships of the line in the Mediterranean. Osborn was at the time blockading the French under Admiral La Clue in the Spanish city of Cartagena preventing them from joining the fleet off Louisburg in Nova Scotia. French command had ordered the Marquis Duquesne to break through the British blockade and reinforce La Clue and then with superiority of numbers break out of Cartagena and make their way to America. Osborn intercepted Duquesne and his three ships of the line and one frigate. The subsequent action became known as the Battle of Cartagena and took place on 28 February 1758. Osborn's squadron captured two of the French line of battle ships and, under the guns of the Spanish castle the 60-gun French Oriflamme was driven on shore by the Montagu and the . Whilst the battle was not particularly grand the annihilation of the forces under Duquesne had two distinct effects. Firstly, the battle restored much of the pride that had been sapped from the navy after several defeats including those at Toulon and Minorca. Secondly, the siege of Louisburg and its surrender led to the French being marginalised as a significant power in North America. The battle can therefore be considered by the British as one of the defining achievements of the Seven Years' War. Had La Clue managed to break out from Osborn's close blockade the modern map of North America might appear quite different.
 Links: a. Seven Years' War b. Nova Scotia c. Nova Scotia d. Cartagena, Spain
Example Output: b

Example Input: Question: In what county is the Melrose Historic District locted? Passage:The Melrose Historic District is a nationally recognized historic district located in Iowa City, Iowa, United States. It was listed on the National Register of Historic Places in 2004. At the time of its nomination it consisted of 134 resources, which included 112 contributing buildings, one contributing site, 20 non-contributing buildings, and one non-contributing structure. This neighborhood first developed as a sparsely populated rural area, and between World War I and World War II developed into an automobile suburb. It grew along with the University of Iowa when it expanded to the west side of the Iowa River, and it borders the large University of Iowa Hospitals and Clinics complex. Among the prominent people who lived here was Howard Jones who coached the Iowa football team from 1916 to 1923. Other prominent residents included professors and local professionals and politicians. 
 Links: a. Iowa City, Iowa b. Iowa Hawkeyes football c. Iowa City, Iowa d. National Register of Historic Places property types
Example Output:
a