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

Example Input: What was the title of Britney Spears' second album (and the single that was released from it)?
Example Output: britney spears

Example Input: Which TV character has sisters called Daisy and Rose?
Example Output: daisy

Example Input: The rivers Gowy, Goyt and Bollin are tributaries of which larger river?
Example Output:
river goyt