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

[Q]: Which novel by A J Cronin is credited with laying down the foundation in Great Britain for the introduction of the National Health Service?
[A]: a. j. cronin

[Q]: Which 1981 film , directed by John Huston, starred footballers Bobby Moore, Pele and Osvaldo Ardiles?
[A]: osvaldo ardiles

[Q]: Who are Athos, Porthos, and Aramis?
[A]:
athos