instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who has written a series of novels, entitled The Dark Tower, of which the first, in 1982, was entitled, The Gunslinger?
answer:
the dark tower


question:
What famous novel invented the terms thoughtcrime and doubleplusgood?
answer:
newspeak


question:
In the film 'Ali' who played the leading role?
answer:

ali