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

[Q]: What is the capital of the American state of Delaware Boise, Dover or Jefferson City?
[A]: delaware

[Q]: Mr Barkis, Edward Murdstone and Tommy Traddles are all characters in which Charles Dickens novel?
[A]: charles dickens

[Q]: Which song title links a 1957 single release by Carl Perkins and a 1963 single by the Dave Clark Five?
[A]:
the dave clark five