Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: What is the Army equivalent to a Group Captain in the R.A.F.?

Answer: british army


Question: Who was in the films Zelig, Stardust Memories, and Broadway Danny Rose?

Answer: broadway danny rose


Question: Who won the 2011 Booker Prize for 'The Sense of an Ending'?

Answer:
the sense of an ending