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

Ex Input:
Established in 1919, which is the world's oldest surviving airline?

Ex Output:
airline


Ex Input:
Which film actor became mayor of Carmel, California in 1986?

Ex Output:
carmel-by-the-sea, california


Ex Input:
Formula One world champions James Hunt, Nigel Mansell, Damon Hill, Lewis Hamilton and Jenson Button are all from which country?

Ex Output:

jenson button