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 wide is the body of water that separates the Eurasian and North American continents? Passage:The Russian Empire began its interest of the Pacific Northwest in the 18th century, initially curious if there was a land connection between the Eurasian and North American Continents. Two expeditions were led by Vitus Bering, with the findings proving the separation of two continents through the Bering Sea. Being the first European nation to chart much of what comprises the modern American state of Alaska, many locations retain Russian place names. The discovery of sizable fur bearing populations by Bering drew the attention of promyshlenniki previously engaged in the Siberian fur trade. Based out of the Siberian ports of Okhotsk or Petropavlovsk, fur trappers sailed and reported the location of land formations like the Aleutian Islands, Kodiak Island and portions of the Alaskan mainland. Relations with Native Alaskans was often terse due to the uncontrolled actions of particular promyshlenniki who killed and raped Indigenous on islands they trapped furs.
 Links: a. Bering Sea b. Siberia c. Russian Empire d. Bering Sea
Example Output: a

Example Input: Question: The year that Debeaumarché was transported from Pantin to Buchenwald, which area was more populated during that time? Passage:He was arrested on 3 August 1944 at the Gare Montparnasse, and questioned harshly by the Gestapo at the Rue des Saussaies. He lost consciousness under the beatings but did not divulge any names; he was subsequently held at Fresnes Prison. Debeaumarché was one of the so-called "77,000" (named for the prisoners' numbers, between 76,000 and 78,000), Fresnes prisoners who were transported by train from Pantin to Buchenwald on 15 August 1944. He was moved to the underground factory of Mittelbau-Dora which produced V-1 flying bombs and V-2 rockets, and posing as an electrical engineer was put to work in the manufacture of the V-1. Maurice Naegelé, a Kapo in the tunnel assembly section, gained the trust of Debeaumarché by relating details of the resistance movement in France. In fact Naegelé had been an agent of the Gestapo, before his deportation. Naegelé denounced Debeaumarché to SS-Oberscharführer Sander, head of surveillance at Mittelbau-Dora. Debeaumarché was arrested with others (including Naegelé) on the night of 3–4 November 1944. They were taken to the Niedersachswerfen SD headquarters, where Naegelé attempted to beat confessions out of the other prisoners. Debeaumarché was sentenced to death on 11 November 1944, but the sentence was not carried out. Instead Debeaumarché was held in solitary confinement, accused of anti-Nazi plotting. In April 1945 he was moved to Bergen-Belsen, where he was liberated during the advance of Allied troops on 15 April 1945 and repatriated to France. On 1 May 1945 he marched down the Champs-Élysées alongside fellow Buchenwald-captive Pierre Dejussieu-Pontcarral.
 Links: a. Oberscharführer b. Pantin c. Buchenwald concentration camp d. Buchenwald concentration camp
Example Output: b

Example Input: Question: Of the two men who founded Die Internationale along with Rosa Luxemburg, which was the eldest? Passage:In August 1914, Luxemburg, along with Karl Liebknecht, Clara Zetkin and Franz Mehring, founded the Die Internationale ("The International") group which became the Spartacus League in January 1916. They wrote illegal anti-war pamphlets pseudonymously signed Spartacus after the slave-liberating Thracian gladiator who opposed the Romans. Luxemburg's pseudonym was Junius, after Lucius Junius Brutus, founder of the Roman Republic. The Spartacus League vehemently rejected the SPD's support in the Reichstag for funding the war, and sought to lead Germany's proletariat towards an anti-war general strike. As a result, Luxemburg and Liebknecht were imprisoned in June 1916 for two and a half years. During imprisonment, Luxemburg was twice relocated, first to Posen (now Poznań), then to Breslau (now Wrocław). smuggled out and illegally published her articles. Among them was The Russian Revolution, criticising the Bolsheviks, presciently warning of their dictatorship. Nonetheless, she continued to call for a "dictatorship of the proletariat", albeit not of the one party Bolshevik model. In that context, she wrote the words "Freiheit ist immer die Freiheit des Andersdenkenden" ("Freedom is always the freedom of the one who thinks differently") and continues in the same chapter: "The public life of countries with limited freedom is so poverty-stricken, so miserable, so rigid, so unfruitful, precisely because, through the exclusion of democracy, it cuts off the living sources of all spiritual riches and progress". Another article written in April 1915 when in prison and published and distributed illegally in June 1916 originally under the pseudonym Junius was Die Krise der Sozialdemokratie (The Crisis of Social Democracy), also known as the Junius-Broschüre or The Junius Pamphlet.
 Links: a. Gladiator b. Karl Liebknecht c. Dictatorship of the proletariat d. World War I
Example Output:
b