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.

Input: Consider 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 Šiauliai 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 Skaudvilė. The 125th Rifle Division was in the corps' first echelon, holding covering the highway and railroad from Tilsit to Šiauliai. 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

Output: a


Input: Consider Input: Question: When was the city where David was born established? Passage:Born into a poor family in Linlithgowshire in Scotland, Bartholomew joined the Merchant Navy at a young age and became a highly experienced sailor, travelling to the Baltic Sea and the West Indies, working on hired merchant ships during campaigns against French islands there at the outbreak of the French Revolutionary Wars. He later served on Greenland whalers, but in 1795 was seized by a press gang at Wapping and forcibly recruited into the Royal Navy. Due a superior education (although where he obtained this education is unknown), Bartholomew was rapidly promoted to midshipman, serving in numerous theatres and becoming a favourite of Admiral Sir Home Riggs Popham. Bartholomew was present at the surrender of the Dutch fleet in 1799, on HMS Romney in the East Indies and in 1802 was in charge of the ship's chronometers during a voyage to the Red Sea. The Peace of Amiens in the same year saw a reduction in the Navy and Bartholomew was placed in reserve.
 Links: a. Whaling b. Red Sea c. HMS Romney (1762) d. West Lothian

Output: d


Input: Consider Input: Question: What countries did Lounge go to in the Southeast Asia cruise? Passage:Lounge entered on active duty with the United States Navy following graduation from the U.S. Naval Academy and spent the next nine years in a variety of assignments. He completed Naval Flight Officer training at Pensacola, Florida, went on to advanced training as a radar intercept officer in the F-4J Phantom II, and subsequently reported to Fighter Squadron 142 (VF-142) based at Naval Air Station Miramar, California. While with VF-142, he completed a nine-month Southeast Asia cruise aboard (participating in 99 combat missions in the Vietnam War) and a seven-month Mediterranean cruise aboard . In 1974, he returned to the U.S. Naval Academy as an instructor in the Physics Department. Lounge transferred to the Navy Space Project Office in Washington, D.C., in 1976, for a two-year tour as a staff project office. He resigned his regular Navy commission in 1978 and joined the Naval Air Reserve. While in the Naval Air Reserve, he served in Reserve Fighter Squadron 201. Later, he became a Lieutenant Colonel in the Texas Air National Guard, serving with the 147th Fighter Interceptor Group.
 Links: a. Southeast Asia b. Mediterranean Sea c. Interceptor aircraft d. Marine Corps Air Station Miramar


Output: a