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

Ex Input:
Which 20th century British prime minister had the longest surname ?

Ex Output:
prime minister of the united kingdom


Ex Input:
Which four letter word beginning with 'F' is a white crumbly Greek cheese, made from sheep's or goats milk and cured in brine?

Ex Output:
sheep


Ex Input:
Who won the 2015 Tour de France?

Ex Output:

2015 tour de france