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

[EX Q]: Who composed the opera 'Albert Herring' in 1947?
[EX A]: albert herring

[EX 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?
[EX A]: sheep

[EX Q]: What is the biggest country by area in Africa?
[EX A]:
africa