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: Did the USS Stribling visit Hawaii before making her way to Japan? Passage:On 30 January 1969, Stribling put to sea from Mayport, Florida, to make her second voyage to the Far East. Heading via the Panama Canal, San Diego, and Pearl Harbor, the destroyer made for Yokosuka, Japan, and then operations off the coast of Vietnam. Stribling participated in "Sea Dragon" and "Market Time" operations, and her duties also included bombardments on the gunline, search and rescue missions usually for downed carrier pilots, and Positive Identification Radar Advisory Zone (PIRAZ) duty. The latter assignment involved riding "shotgun" for larger PIRAZ ships armed with more sophisticated radar and target designation systems. That summer, Stribling plane-guarded for the carriers operating on "Yankee Station" in the Gulf of Tonkin. When not operating in the combat zone, she put into Kaohsiung, Taiwan; Hong Kong; and Subic Bay in the Philippines for repairs after a collision with a barge being towed by RVN tug during a nighttime underway replenishment . On 2 August 1969, Stribling cleared the combat zone to return home. On her way, she stopped at Kure and Yokosuka, Japan; Pearl Harbor; San Diego; Acapulco Mexico, and Panama. On 17 September 1969, she reentered Mayport.

Example Output: b

Example Input: Question: What country was Bell located in? Passage:The piezoelectric properties of quartz were discovered by Jacques and Pierre Curie in 1880. The first quartz crystal oscillator was built by Walter G. Cady in 1921. In 1923, D. W. Dye at the National Physical Laboratory in the UK and Warren Marrison at Bell Telephone Laboratories produced sequences of precision time signals with quartz oscillators. In 1927, the first quartz clock was built by Warren Marrison and J. W. Horton at Bell Telephone Laboratories. The next 3 decades saw the development of quartz clocks as precision time standards in laboratory settings; the bulky delicate counting electronics, built with vacuum tubes, limited their use elsewhere. In 1932 a quartz clock was able to measure tiny variations in the rotation rate of the Earth over periods as short as a few weeks. In Japan in 1932, Issac Koga developed a crystal cut that gave an oscillation frequency with greatly reduced temperature dependence. The National Bureau of Standards (now NIST) based the time standard of the US on quartz clocks between the 1930s and the 1960s, after which it transitioned to atomic clocks. The wider use of quartz clock technology had to await the development of cheap semiconductor digital logic in the 1960s. The revised 14th edition of Encyclopædia Britannica stated that quartz clocks would probably never be affordable enough to be used domestically.

Example Output:
b

