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

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

Example Input: Feb 15, 1564 saw the birth of what famed Italian physicist, mathematician, astronomer, and philosopher, who discovered the first 4 moons of Jupiter?
Example Output: astronomer

Example Input: Will you still be sending me a valentine is a line from which Beatles song?
Example Output:
the beatles