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

Example Input: Which horse won the 2009 Epsom Derby?
Example Output: 2009 epsom derby

Example Input: Which entertainer uses various names, including Puff Daddy, P. Diddy and Diddy?
Example Output: p. diddy

Example Input: Which is the largest desert in South America?
Example Output:
desert