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

Ex Input:
Who married Brooke Shields in 1997?

Ex Output:
brooke shields

Ex Input:
Which of the American Idol judges has been there for all 10 seasons?

Ex Output:
american idol

Ex Input:
Which U.S. state did Bill Clinton govern?

Ex Output:
bill clinton