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.

Ex Input:
Question: Did the highest scoring fighter ace have any siblings? Passage:After a short rest, the 90th continued across the Moselle River to take Mainz, 22 March, and crossed the rivers Rhine, the Main, and the Werra in rapid succession. Pursuit continued to the Czech border, 18 April 1945, and into the Sudetes mountain range. The division was en route to Prague when they came upon the remaining 1500 emaciated prisoners left behind by the SS at Flossenbürg concentration camp. Today, a memorial wall at the former camp honors the 90th as the liberators of Flossenbürg concentration camp. A week later, word came that the war in Europe ended on 8 May 1945. On that same day, Erich Hartmann, the highest-scoring fighter ace in history, along with a squadron of the elite Jagdgeschwader 52 fighter wing (the highest-scoring fighter wing in history), surrendered to the 90th.
 Links: a. Main (river) b. Jagdgeschwader 52 c. Prague d. Erich Hartmann

Ex Output:
d


Ex Input:
Question: What country did McGillivray return to before taking a trip to Scotland and England? Passage:McGillivray returned to Montreal in 1793 and then took a trip to Scotland and England. He was now a partner in McTavish, Frobisher & Co., who controlled the NWC. With John Gregory, he was sent to manage the company's huge depot at Grand Portage, stirring jealousy among some of the other partners. When Joseph Frobisher retired in 1798, McGillivray took his place. He set up an agency at New York City to get around the East India Company's monopoly enabling them to trade with China. He was closely involved too with the firm of McTavish, Fraser & Co., at London, managed by another relation of his uncle's, John Fraser. In 1803, he helped organize the move of the NWC's main depot from Grand Portage to Thunder Bay. All this time he was dealing with relations with the Hudson's Bay Company and the splinter XY Company that had broken away from the NWC, led by John Richardson.
 Links: a. Montreal b. Montreal c. North West Company d. New York City

Ex Output:
a


Ex Input:
Question: When was the town located north-west of Bar-sur-Seine established? Passage:Bar-sur-Seine is located some 20 km south-east of Troyes and 25 km north-west of Montliot-et-Courcelles. Access to the commune is by the D671 road from Virey-sous-Bar in the north-west which passes through the town and continues south-east to Celles-sur-Ource. The D443 comes from Magnant in the north-east also passing through the village and continuing south-west to Villemorien. The D63 also goes to Magnant by a slightly longer route. The D4 goes from the town to Ville-sur-Arce in the south-east. The D49 branches from the D443 on the right bank of the Seine and goes north-west to Courtenot. There is also the railway passing through the commune from Saint-Parres-lès-Vaudes in the north-east and continuing to the next station at Polisot in the south-east. Apart from the town there are the hamlets of Avaleur and La Bordé. There are large forests to the north-east and south-west of the town with the rest of the commune farmland.
 Links: a. Troyes b. Saint-Parres-lès-Vaudes c. Polisot d. Villemorien

Ex Output:

a