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

Example Input: Which jockey won the 1981 UK Grand National on Aldaniti?
Example Output: aldaniti

Example Input: Which horse won the 2008 Grand National?
Example Output: 2008 grand national

Example Input: Basil Rathbone made 14 Sherlock Holmes films. Who played the part of Dr Watson?
Example Output:
watson