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

Ex Input:
Charlie Chaplin who died on Christmas Day in 1977, co founded which film studio along with Mary Pickford, Douglas Fairbanks?

Ex Output:
douglas fairbanks


Ex Input:
Cilantro is the leaf of which herb?

Ex Output:
cilantro


Ex Input:
Who played Ron Kovic in the 1989 film 'Born on the Fourth of July'?

Ex Output:

born on the fourth of july