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

[Q]: Brothers Richard and Simon Mantell played which sport for England in the 2010 Commonwealth Games?
[A]: 2010 commonwealth games

[Q]: Christian Grey is a character in what recent book trilogy?
[A]: christian grey

[Q]: Which author was married to Catherine Hogarth?
[A]:
catherine dickens