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

Ex Input:
Which 'brothers' had a number one hit in May 1958 with 'All I Have To Do Is Dream'?

Ex Output:
all i have to do is dream

Ex Input:
Which race run at Chantilly in June is often referred to as the French Derby?

Ex Output:
chantilly racecourse

Ex Input:
Who was the Russian leader at the time of the Cuban missile crisis?

Ex Output:
cuban missile crisis