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: Which ship had been in service longer at the time when he was on them, the one where he still held sub-lieutenant rank or the one where David had been promoted to full lieutenant? Passage:He was assigned as a midshipman on 1 May 1929 after finishing top of his class in five subjects. In 1930 he was assigned to the battleship Marlborough, part of the Third Battle Squadron; and the following year to the battlecruiser in September 1931 on which he served with fellow midshipman, and future vice admiral, Peter Gretton. While serving on the ship, Wanklyn was promoted to acting sub-lieutenant (the equivalent of an army second lieutenant) on 1 January 1932. Soon afterwards he moved to the naval gunnery school - HMS Excellent - at Whale Island, Portsmouth to learn more about naval navigation to qualify for his second ring at the rank of lieutenant. In February 1933 he moved to HMS Dolphin and was promoted to lieutenant on 1 February 1933.

Example Output: b

Example Input: Question: How many teams were in Macedonian First League? Passage:He was born in Ohrid. After playing in the youth teams of FK Partizan, he begin his senior career playing with another Serbian club FK Dinamo Vranje. In 2007, he returned to Macedonia and signed with Macedonian First League club FK Pobeda where he stayed two seasons. In summer 2009 he moved to FK Olimpik Sarajevo playing in the Premier League of Bosnia and Herzegovina, but next winter he moved to Slovenia, to NK Krško. Since January 2011 he will play with FK Metalurg Skopje in the Macedonian First League. In summer 2011 he moved to Albania, where he represented two clubs during the 2011–12 Albanian Superliga season, KS Pogradeci and Shkumbini Peqin. In summer 2012 he moved to Greece and joined Football League side Anagennisi Epanomi F.C.. He play now in 3 Swiss league for Old Boys.

Example Output: a

Example Input: Question: How long is the railway tunnel opened in 1886? Passage:In 1873, the Hoylake and Birkenhead Railway was authorised to construct two extensions to its lines. One was a short connecting section near to Birkenhead docks, and the other was the extension from Hoylake to West Kirby. The station and the extension were opened on 1 April 1878 as the terminus of the Wirral Railway's route from Birkenhead Park station. The station's original signal box was built in 1886, to a London and North Western Railway (LNWR) design. This signal box was removed and replaced in 1932. After the opening of the Mersey Railway Tunnel in 1886, carriages were operated through Birkenhead Park, every half-hour, all the way to James Street station in Liverpool. As traffic increased, the line into West Kirby was doubled, from a single track, in 1896. After a board meeting on 28 October 1895, it was decided to extend the line from Hooton, into West Kirby. The station was relocated on the western side of the original station, with an enlarged island platform and rebuilt, in 1898-9, in red brick, with a turreted clock tower and mock Tudor frontage. A further platform was constructed for the Hooton line, on the eastern side of the original station. The site of the original station was used for goods sidings. In the present day, this is the site of The Concourse, a community building operated by Wirral Metropolitan Borough Council.

Example Output:
a