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

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:
In which city could you visit the Anne Frank House?

Ex Output:
anne frank house


Ex Input:
What is the scientific symbol for calcium?

Ex Output:

calcium