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: How many engines does the Boeing bomber that land at Taichung International Airport have? Passage:Taichung International Airport was constructed during the era of Japanese rule and was named . The United States Air Force (USAF) had been garrisoning the base with two fighter squadrons until the Sino-American Mutual Defense Treaty came into force on March 3, 1955. The airport then expanded in 1954 according to the Sino-American Mutual Defense Treaty, and later renamed Ching Chuan Kang Air Base (CCK) in memory of General Qiu Qingquan. In 1966 the American Air Force established a joint forces air-base at CCK. It was the largest air force base in the Far East at the time, allowing Boeing B-52 Stratofortress bombers to land. During the Vietnam War, CCK became a depot for the USAF. The US Military used CCK and Shuinan Airport to run many of its long-distance Vietnam, Cambodia and Laotian bombing, scouting and cargo transport runs during the Vietnam War era. This base was shut down and most American facilities were removed after U.S. established diplomatic relations with the China in 1979.

Example Output: b

Example Input: Question: How many cast members did Line of Duty when it premiered on BBC2? Passage:Mercurio's next original drama series, Line of Duty (first broadcast 26 June 2012), premiered as BBC2's then best-performing drama series in 10 years with 4.1 million viewers. A well-received second series (first broadcast 12 February 2014) resulted in the BBC commissioning two further series for production in 2015 and 2016. The first series was nominated for a Royal Television Society Award for Best Drama Series and earned Mercurio his third nominations as Best Drama Writer by the Royal Television Society and The Writers' Guild of Great Britain. In 2014, Line of Duty was named in the Top 50 BBC2 Shows of All-Time, and named best television drama of the year by The Observer, and in 2016 ranked among the best BBC shows of all time and among the best police series of all time. In 2015, the second series won the Royal Television Society Award for Best Drama Series. and was nominated for four BAFTA Awards. Series 3 of Line of Duty became the most watched drama series broadcast on BBC2 in the multichannel era. Series 4 transferred to BBC One, consisting of six episodes broadcast from 26 March 2017.

Example Output: a

Example Input: Question: What was the final rank of the U.S. Army officer who drove the Navajo people out of the their ancestral homeland? Passage:The Navajo War was not directly a part of the Black Hawk War, but it may have been a source of some of the native warriors who fought in the Black Hawk War. Black Hawk's success drew fighters from other Utes in Colorado, Apaches from New Mexico, and many Navajos. In the winter of 1866 Black Hawk and his band went to the Four Corners region where he received many new recruits. So many Navajos joined him that they formed almost half his raiders. The Navajo had been decimated by the U.S. Army under Kit Carson and forced out of their ancestral homeland. The remaining Navajos were eager for a chance to build up their herds at the expense of white settlers. Manuelito, the most important chief refusing to relocate to the Bosque Redondo Reservation, jointly led Black Hawk's raids on Mormon settlements in southern Utah during 1866. The attacks commenced at Pipe Springs, then a Mormon settlement on the Arizona-Utah border. The retaliation for the Pipe Springs raid left four unarmed Paiutes dead for murders they had nothing to do with. This brought some Paiute fighters to Black Hawk's band. Hopis hearing of the Navajo's movements feared they were to be attacked and struck first ambushing Manuelito's Navajos. The raids continued at the Paria settlements, and Kanab, who sent pleas for help against the raids. In subsequent years, the raids continued in the south by Navajos and Paiutes, which raised tensions to a fever pitch which would result in the worst massacre of the war at Circleville. Chief Kanosh predicted that in 1867 six thousand Navajos would wipe out the Mormon towns in southern Utah.

Example Output:
b