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: On what date did Morsi take office? Passage:Following the Egyptian revolution of 2011 as part of the regional Arab Spring protests, Mubarak was ousted and the following year Mohamed Morsi who is backed by the Muslim Brotherhood won Egypt's first democractic elections. In 2013 Morsi was removed from power in a coup led by Abdel Fattah el-Sisi. Sisi has called for religious tolerance and has cracked down and banned the Muslim Brotherhood. He has closed thousands of mosques and has banned 'burkinis' on some beaches. A The Economist report in 2017 stated that Egyptians were turning more secular again, with supporters of sharia law dropping by more than half since 2011, people praying less than before, and gender equality now being widely accepted. The government has also acted to preserve its Jewish heritage through the restoration of the abandoned Eliyahu Hanavi Synagogue in Alexandria in 2017.

Example Output: b

Example Input: Question: Which album by A Day to Remember sold more copies, their debut or their second album? Passage:The discography of American rock band A Day to Remember consists of six studio albums, three video albums, three extended plays and thirteen singles. The band signed to Indianola in February 2005 and released their debut album And Their Name Was Treason a few months later. Their second album, For Those Who Have Heart, was released in January 2007 and peaked at number 17 on the Heatseekers Album chart in the US; a re-release charted at number 43 on the Independent Albums chart in the US. Released in February 2009, Homesick charted at number 21 on the Billboard 200 chart and at number 1 on the Independent Albums chart. From the album, only the "Have Faith in Me" single charted; at number 40 on the Alternative Songs chart. Second single "Downfall of Us All" and album track "If It Means a Lot to You" were both certified Gold by the RIAA for 500,000 downloads each. Fourth album What Separates Me from You (2010) debuted at number 11 on the Billboard 200 and its lead single "All I Want" peaked at number 12 on the Alternative Songs chart. Fifth album Common Courtesy (2013) was first released only digitally due a legal label dispute; a physical release followed later. The band released their sixth album, Bad Vibrations, in 2016.

Example Output: a

Example Input: Question: How long did the construction of the USS Castle Rock take? Passage:USS Castle Rock (AVP-35) was a United States Navy Barnegat-class small seaplane tender in commission from 1944 to 1946 which saw service in the late months of World War II. After the war, she was in commission in the United States Coast Guard as the Coast Guard cutter USCGC Castle Rock (WAVP-383), later WHEC-383, from 1948 to 1971, seeing service in the Vietnam War during her Coast Guard career. Transferred to South Vietnam in 1971, she served in the Republic of Vietnam Navy as the frigate RVNS Trần Bình Trọng (HQ-05) and fought in the Battle of the Paracel Islands in 1974. When South Vietnam collapsed at the end of the Vietnam War in 1975, Trần Bình Trọng fled to the Philippines, where she served in the Philippine Navy from 1979 to 1985 as the frigate RPS (later BRP) Francisco Dagohoy (PF-10).

Example Output:
a