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

Example Input: Which is the largest continent on Earth?
Example Output: earth

Example Input: Ornette Coleman, Louis Armstrong and Charles Mingus are associated with what style of music?
Example Output: charles mingus

Example Input: I am the egg man' is a line from which Beatles song?
Example Output:
the beatles