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 long had Shumilov been in the military when the Soviet invaded Poland? Passage:Colonel (promoted to Major General 4 June 1940) Mikhail Shumilov took command in April 1938. In September 1939, the corps fought in the Soviet invasion of Poland as part of the 10th Army. It included the 6th, 33rd, and the 121st Rifle Divisions at the beginning of the invasion on 17 September. By 2 October, these divisions had transferred to other units, and it included the 29th, 64th, and 145th Rifle Divisions instead. The corps headquarters relocated to Grodno in November and became part of the 11th Army. Between June and July 1940 it was briefly headquartered at Kovno before moving to Siauliai in August, part of the Baltic Special Military District. The 11th transferred to the 8th Army in October, and included the 11th and 125th Rifle Divisions by the outbreak of the war. It defended a 40-kilometer sector on the left flank of the 8th Army, with its headquarters in the forests northwest of Skaudvile. The 125th Rifle Division was in the corps' first echelon, holding covering the highway and railroad from Tilsit to Siauliai. The 48th Rifle Division (part of the adjacent 10th Rifle Corps), after moving forward from Riga, was to take up positions on the left of the 125th. The corps' 73rd Corps Artillery Regiment included four battalions of 107 mm guns.
Links: a. Mikhail Shumilov b. 11th Rifle Division c. 10th Rifle Corps d. Baltic Military District
Example Output: a

Example Input: Question: What city did Empire Nightingale arrive in on July 1? Passage:Empire Nightingale would appear to have crossed the Atlantic Ocean from the United States independently, as she does not appear as a member of a convoy until 27 June, when she departed Middlesbrough, Yorkshire as a member of Convoy EC 31. The convoy had departed from Southend, Essex the previous day and arrived at the Clyde on 1 July. She left the convoy at Oban, Argyllshire, departing on 3 July for Baltimore, Maryland, United States, which was reached on 22 July. Empire Nightingale departed Baltimore on 10 August for Halifax, Nova Scotia, Canada, arriving five days later. Carrying a cargo of steel, she departed on 21 August with Convoy HX 146, which arrived at Liverpool, Lancashire on 6 September. She left the convoy at Loch Ewe to join Convoy WN 177, which departed from Oban on 5 September and arrived at Methil, Fife on 8 September. Empire Nightingale then joined Convoy FS 589, which departed that day and arrived at Southend on 10 September. She left the convoy at Hull, Yorkshire on 10 September.
Links: a. Halifax, Nova Scotia b. River Clyde c. Southend-on-Sea d. Southend-on-Sea
Example Output: b

Example Input: Question: Did Billy Connors attend high school and college in the same state? Passage:When he was 12, Connors was a member of the Schenectady All-Star team that won the 1954 Little League World Series, beating the team from Colton, California, 75. He graduated from Linton High School in Schenectady in 1959 and attended Syracuse University for two years. He signed with the Chicago Cubs as a pitcher-infielder in 1961. During a season split between the Class B Northwest League and the Class D Sophomore League, Connors batted only .226 with no home runs and 32runs batted in while hurling 29 innings as a pitcher. In 1962 in the Class D Florida State League, Connors was converted to pitcher-catcher, and improved his batting mark to .296 with two homers and 35 RBI. He also increased his pitching load to 64 innings and posted a sparkling 2.64earned run average. In 1963, back in the Northwest League, he became a full-time pitcher, winning 12 games and notching 138 strike outs.
Links: a. Schenectady High School b. Strike Out c. Syracuse University d. Chicago Cubs
Example Output:
a