In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.

Example Input: Question: What is one key difference between the Indus Valley civilization and early Vedic civilizations? Passage:The book discusses four prehistoric migrations in India. The book mentions that the Harappans were a mixture of Zagros agriculturists and First Indians, a wave of migrants who came from Africa into Arabia and then reached India around 65,000 years ago. Citing recent DNA evidence, the book traces the subsequent large migrations of anatomically modern humans into India—of agriculturalists from Iran between 7000 and 3000 BCE and Indo-European languages speaking pastoralists from the Central Asian Steppe (Aryans) between 2000 and 1000 BCE, among others. Tony Joseph used pizza as a metaphor to explain the break-up of subcontinental society. The book also discusses about similarities and differences between Indus Valley civilization and early Vedic civilization. The book mentions that ‘Aryan’ culture was most likely the result of interaction, adoption and adaptation among those who brought Indo-European languages to India and those who were already well-settled inhabitants of the region, and that Sanskrit and Vedas developed in the Indian subcontinent. Various tribes like the Andamanese and the Semang (Malay Peninsula), the Mani (Thailand) and the Aeta people (the Philippines) were the earliest inhabitants of Southeast Asia. According to Joseph, Proto-Dravidian is related to the Elamitic language of Iran. Caste system in India is a recent social system, reflected in sharply reduced inter-marriage (endogamy) and genetic mixing after 100 AD. This book also takes into account the path-breaking DNA research and findings from geneticist David Reich's research.

Example Output: a

Example Input: Question: Is Vitebsk the capital of a country? Passage:A.P. Rosengolts was born in Vitebsk on November 4, 1889. He was the son of a Jewish merchant. He joined the Bolshevik faction of the Russian Social-Democratic Workers' Party (RSDRP) in 1905, the year of the first, abortive Russian Revolution. He worked as an insurance agent and carried out work for the Bolshevik party in Vitebsk, Kiev, Ekaterinoslav and Moscow. Rosengolts played an active role in the Revolution of 1917. He was a member of the Executive Committee of the Moscow City Council, the Moscow Military-Revolutionary Committee and the All-Russian Military-Revolutionary Committee. He was a leading officer in the Red Army and, during the Russian Civil War, worked closely with L.D. Trotsky. After the Civil War, Rosengolts worked successively for the Commissariats of Transportation and Finance and the Directorate of the Red Army Air Force. He served as ambassador to Britain from 1925 to 1927 and oversaw Soviet espionage in Britain. He became a member of the Central Committee of the Communist Party of the Soviet Union in 1927 and held various high positions in the Communist Party and the Soviet government. In 1930 he was appointed People's Commissar of Foreign Trade. On June 14, 1937, Rosengolts was dismissed from this office and on October 7, 1937, he was arrested. He was one of the defendants of the third Moscow Trial, along with Nikolai Bukharin, Alexey Rykov and other prominent Soviet officials. The accused faced a long list of capital charges, including plotting to assassinate Lenin and Stalin, espionage and sabotage. Like most of his co-defendants, Rosengolts confessed. He was convicted, sentenced to death and shot on March 15, 1938 in Moscow. He was rehabilitated in 1988.

Example Output: b

Example Input: Question: How far away from the town of his birth was the academy that Morison attended at age 14? Passage:Born in New Bedford, Massachusetts, he was the son of John Hopkins Morison, a Unitarian minister. At age 14, he entered Phillips Exeter Academy and graduated by age 16. He went on to Harvard College where he was a classmate of philosopher John Fiske. Morison received a Bachelor of Arts degree in 1863 when he was just 20. After a brief break he attended Harvard Law School where he would receive a Bachelor of Laws degree by 1866 and was admitted to the New York Bar. In 1867, with only general mathematics training and an aptitude for mechanics, he abandoned the practice of law and pursued a career as a civil engineer and builder of bridges. He would apprentice under the supervision of engineer Octave Chanute during the construction of the first bridge to cross the Missouri River, the swing-span Kansas City Bridge.

Example Output:
a