Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Example Input: Christian Grey is a character in what recent book trilogy?
Example Output: christian grey

Example Input: Who won the 2011 Booker Prize for 'The Sense of an Ending'?
Example Output: the sense of an ending

Example Input: Which Orbison number was used in the David Lynch cult classic of 1986 Blue Velvet?
Example Output:
blue velvet