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

Example Input: Chris Difford and Glenn Tilbrook founded which band in 1974?
Example Output: chris difford

Example Input: The town of Anthony in which US state was known as 'The Leap Year Capital of the World'?
Example Output: united states

Example Input: Appassionata is a name given to Piano Concerto number 23 by which composer?
Example Output:
piano sonata no. 23