Instructions: 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.
Input: Question: How many copies have sold of the book that Lynch discussed at its 500th anniversary in 2011? Passage:At Boston College, Lynch was a Bradley Postdoctoral Fellow. He taught at the University of Dallas Rome campus. In 2005, he participated in ISI/Jack Miller Center’s Lehrman Summer Institute. In 2006, he was Faculty Fellow at the Foundation for Defense of Democracies. Between 2006 and 2007, Lynch was Senior Advisor at the United States Department of State. And in 2011, he was a faculty member on the Hertog Political Studies Program in Washington, D.C. Lynch was granted the Olin Faculty Fellowship to support his work on a new book about Machiavelli's thoughts on war. Additionally, on the 500th anniversary of the writing of Machiavelli's The Prince, Lynch was discussant in the "Machiavelli's The Prince at 500: Rereading The Prince in the 21st Century" Panel at the 2013 American Political Science Association (APSA) Annual Meeting and Exhibition in Chicago, and he spoke at Harvard University on the question of whether Machiavelli is a philosopher. Lynch has been a part of workshops and seminars at Army War College, Naval War College, and National Defense University. Additionally, he has presented lectures at the Air Force Academy and the National War College. Currently, Lynch is Professor of Great Ideas and Political Science at Carthage College.

Output:
a