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

Ex Input:
What was the last silent film in which Chaplin's little tramp appeared?

Ex Output:
chaplin


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

Ex Output:
ashgabat


Ex Input:
Which actress married Dennis Quaid on Valentine's Day in 1991?

Ex Output:

dennis quaid