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

Ex Input:
What is the smallest country in Central America Costa Rica, Venezuela or El Salvador?

Ex Output:
central america


Ex Input:
Cilantro is the leaf of which herb?

Ex Output:
cilantro


Ex Input:
Which Conservative Party chairman was the son of actress Dinah Sheridan?

Ex Output:

dinah sheridan