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

Ex Input:
Brasilia is the capital but which city in Brazil has the largest population?

Ex Output:
brazil


Ex Input:
With what sport is Dennis Compton associated?

Ex Output:
denis compton


Ex Input:
For which film did Catherine Zeta-Jones win an Academy Award as Best Supporting Actress?

Ex Output:

catherine zeta-jones