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:
Which Beatle played Youngman Grand in The Magic Christian 1969, with Peter Sellers?
answer:
the beatles


question:
Who played the part of 'Clayton Farlow' in 'Dallas'?
answer:

clayton farlow