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

Ex Input:
Which city has sports teams known as the 'Maple Leafs' and the 'Blue Jays'?

Ex Output:
toronto blue jays


Ex Input:
Which boxer was nicknames `The Brown Bomber`?

Ex Output:
boxing


Ex Input:
In which country was the ballet dancer Carlos Acosta born?

Ex Output:

carlos acosta