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

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

A: sheep
****
Q: What is the title of the four-episode special of 'Doctor Who', made for the Red Nose Day telethon in the UK, broadcast in March 1999?

A: doctor who
****
Q: Since South Sudan ceded from Sudan in 2011, what has been the largest country, by area in Africa?

A:
africa
****