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

Who has written a series of novels, entitled The Dark Tower, of which the first, in 1982, was entitled, The Gunslinger?
the dark tower

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

What is the translation of the work Le Sacre du Printemps (in ballet)?

le sacre du printemps

