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 did the king who was painted by Jan Matejko rule Poland? Passage:Modern history accepts this gateway as one of three constructed by Yaroslav the Wise. The golden gates were built in 1017-1024 (6545 by the Byzantine calendar) at about the same time the Saint Sophia Cathedral was erected. Mentions of an older construction, such as the one presented on a painting by Jan Matejko of king Bolesław I of Poland striking the Golden Gate with his sword during the intervention in the Kievan succession crisis in 1018, it is now regarded a legend. Originally named simply the Southern Gate, it was one of the three main entrances to the walled city, along with the Ladski and Zhydivski (Polish and Jewish) Gates. The last two have not survived. The stone fortifications stretched for only 3.5 km. The fortification of the Old Kyiv (Upper City) stretched from the Southern Gates down to what is now Independence Square and where the Lechitic Gate was located. From there, the moat followed what is now Kostyol Street, skirting St. Michael's Monastery and continuing along today's Zhytomyr Street toward the Jewish Gates (at ). From there, the fortification stretched what is now Yaroslaviv Val ("Yaroslav's Rampart") Street back to the Southern Gate.
 Links: a. Bolesław I the Brave b. Maidan Nezalezhnosti c. Bolesław I the Brave d. Lechites
Example Output: a

Example Input: Question: In which country did Hue attend college? Passage:Robert Hues (1553 – 24 May 1632) was an English mathematician and geographer. He attended St. Mary Hall at Oxford, and graduated in 1578. Hues became interested in geography and mathematics, and studied navigation at a school set up by Walter Raleigh. During a trip to Newfoundland, he made observations which caused him to doubt the accepted published values for variations of the compass. Between 1586 and 1588, Hues travelled with Thomas Cavendish on a circumnavigation of the globe, performing astronomical observations and taking the latitudes of places they visited. Beginning in August 1591, Hues and Cavendish again set out on another circumnavigation of the globe. During the voyage, Hues made astronomical observations in the South Atlantic, and continued his observations of the variation of the compass at various latitudes and at the Equator. Cavendish died on the journey in 1592, and Hues returned to England the following year.
 Links: a. St Mary Hall, Oxford b. Navigation c. Circumnavigation d. Equator
Example Output: a

Example Input: Question: During which century was the navy founded that the Empire Battleaxe was commissioned into? Passage:Empire Battleaxe was transferred under the terms of lend lease shortly after being completed. She was chartered by the Ministry of War Transport and operated under the management of Cunard White Star Line. She came to the United Kingdom as part of Convoy HX267, which departed New York on 19 November 1943. Empire Battleaxe was carrying a cargo of fish She took part in exercises in the Cromarty Firth and Moray Firth to train troops in preparation for the invasion of France. In May 1944, she took part in an exercise near Littlehampton. She took part in the Normandy Landings carrying part of 537 LCA Flotilla, carrying troops to Sword Beach. The flotilla that Empire Battleaxe was in consisted of four ships, the others being , and . Empire Battleaxe was close to HNoMS Svenner when that ship was torpedoed and sunk by E-boats. Among those she carried to Normandy was the actor David Niven. After landing her troops, Empire Battleaxe returned to the United Kingdom to collect a second wave of troops. Empire Battleaxe was then commissioned into the Royal Navy as HMS Empire Battleaxe.
 Links: a. Sword Beach b. Royal Navy c. Royal Navy d. E-boat
Example Output:
b