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: Who won the World Cup where the Costa Rican team had a prominent performance? Passage:Since the late 1980s, the team has continuously been visible as a solidly competitive side, with a prominent performance in the 1990 FIFA World Cup in Italy, making it to the knockout stage in their debut after finishing second in their group during the first phase, below Brazil. They also managed to qualify for the 2002 and 2006 FIFA World Cups. In 2014, Costa Rica made their best performance in history by finishing first in their group that consisted of three former World Cup champions: Uruguay, Italy, and England. During the Round of 16 they defeated Greece 5–3 via a penalty shootout after a 1–1 draw. Moreover, during the match against a much better team, Navas saved more than 15 shots due to the Costa Rican very weak defense. The match was characterized as "Navas vs Greece". They reached the quarterfinals for the very first time as the Ticos were defeated by the Netherlands also in a penalty shootout (3–4) after a scoreless draw on 5 July. Their 2018 World Cup campaign ended in a 4th place group stage exit with their only point coming from a 2-2 draw vs Switzerland.
 Links: a. 2006 FIFA World Cup b. 1990 FIFA World Cup c. 2006 FIFA World Cup d. Keylor Navas

Ex Output:
b


Ex Input:
Question: How long was the Nazi Party around for before Stahlecker joined it? Passage:On 1 May 1932, Stahlecker joined the Nazi Party (no. 3,219,015) as well as the SS (no. 73,041). On 29 May 1933, he was appointed deputy director of the Political Office of the Württemberg State Police. In 1934, he was appointed head of the Gestapo in the German state of Württemberg and soon assigned to the main office of the Sicherheitsdienst (SD). On 11 May 1937, he became head of the Gestapo in Breslau. After the incorporation of Austria in 1938, Stahlecker became SD chief of the Danube district (Vienna), a post he retained even after being promoted to SS-Standartenführer. In the summer of 1938, Stahlecker became Inspector of the Security Police in Austria, succeeding Gestapo chief Heinrich Müller in that position. As of 20 August 1938, Stahlecker was the formal head of the Central Agency for Jewish Emigration in Vienna, though its de facto leader was Adolf Eichmann. Differences of opinion with Reinhard Heydrich motivated Stahlecker to move to the Auswärtiges Amt (Foreign Office), after which he held posts as the commander of the Security Police and SD in the Protectorate of Bohemia and Moravia under SS-Brigadeführer Karl Hermann Frank. In mid-October 1939, Eichmann and Stahlecker decided to begin implementation of the Nisko Plan.
 Links: a. Nazi Party b. Lublin Reservation c. Federal Foreign Office d. Brigadeführer

Ex Output:
a


Ex Input:
Question: What years did the Prince-Bishop of Basel reign? Passage:The Vorem Holz 3 archeological site contains the remains of a Bronze Age settlement in the Pieterlen municipality. A first- to third-century Roman estate has also been discovered. During the Middle Ages there were several settlements in the modern municipal borders. A medieval bath house was found at Thürliweg. The early medieval Totenweg cemetery served two different settlements during the 7th-8th centuries. A medieval fortification at Gräuschenhubel has also been discovered. During the Late Middle Ages the village was mentioned as the personal property of the Lords of Pieterlan. By the end of the 13th century, the village passed through the hands of a number of nobles before ending up under the Prince-Bishop of Basel. Under the Prince-Bishops the village was combined with Romont, Reiben (now part of Büren an der Aare and Meinisberg) to form the southern-most ecclesiastical district of the Erguel seigniory. The low court met in Pieterlen while the high court was in Reiben and was held on the bridge over the Aare river. Militarily it was part of the banner of Biel.
 Links: a. Prince-Bishopric of Basel b. Early Middle Ages c. Biel/Bienne d. Romont, Bern

Ex Output:

a