instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which four letter word beginning with 'F' is a white crumbly Greek cheese, made from sheep's or goats milk and cured in brine?
answer:
sheep


question:
Which novel by A J Cronin is credited with laying down the foundation in Great Britain for the introduction of the National Health Service?
answer:
a. j. cronin


question:
Madeline Bray married which eponymous character in a Charles Dickens novel?
answer:

charles dickens