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

Example Input: Ashgabat is the capital of which country, a former Soviet republic in Asia?
Example Output: ashgabat

Example Input: Which singer provides the voice for Chef in South Park?
Example Output: chef

Example Input: Which actor turned singer had a UK number one hit single with `Ain`t No Doubt` in 1992?
Example Output:
ain't no doubt