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

Example Input: Cilantro is the leaf of which herb?
Example Output: cilantro

Example Input: Which hero of science fiction was created by Alex Raymond?
Example Output: alex raymond

Example Input: Which English monarch was killed at the Battle of Bosworth in 1485?
Example Output:
battle of bosworth field