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

Example Input: What city is closest to Copacabana beach?
Example Output: copacabana, rio de janeiro

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

Example Input: Who resigned as CEO of Barclay's after the LIBOR tax rate scandal?
Example Output:
barclays