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 taken over the TV role of Doctor Who, from actor David Tennant?
answer:
doctor who


question:
The towns od Grimsby and Cleethorpes are in which English county?
answer:
grimsby


question:
The epitaph for which American singer who died in 1988 was 'The best is yet to come'?
answer:

the best is yet to come