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

Ex Input:
Who was re-elected Prime Minister of Canada in May 2011?

Ex Output:
prime minister of canada

Ex Input:
Which jockey rode Red Alligator to victory in the 1968 Grand National?

Ex Output:
red alligator

Ex Input:
In the human body what is a carotid?

Ex Output:
common carotid artery