instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
In which famous film did Michael Caine play a character named Charlie Croker?
answer:
charlie croker


question:
Which country music star, writer of the song Your Cheatin' Heart, died on New Year's Day 1953?
answer:
country music


question:
Who wrote the novel 'The Call Of The Wild'?
answer:

call of the wild