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

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

Ex Output:
ashgabat

Ex Input:
Cilantro is the leaf of which herb?

Ex Output:
cilantro

Ex Input:
US rock musician Carmine Appice is famous for playing which instrument?

Ex Output:
carmine appice