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

Ex Input:
Austin is the state capitol of which US State?

Ex Output:
austin, texas


Ex Input:
Which group had a top ten hit with 'Driving in My Car' in 1982?

Ex Output:
driving in my car


Ex Input:
The first world's fair in the United States since World War II, what city hosted the 1962 World's Fair, known as Century 21 Exposition?

Ex Output:

century 21 exposition