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

Ex Input:
Better known as an actor, who directed the film 'A Bronx Tale'?

Ex Output:
a bronx tale

Ex Input:
Which entertainer uses various names, including Puff Daddy, P. Diddy and Diddy?

Ex Output:
p. diddy

Ex Input:
What country, after having governed it for 155 years, transferred its sovereignty of Hong Kong to China in 1997?

Ex Output:
china