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

[Q]: The rivers Axe, Brue, Cary, Parrett, eta, are in which English county?
[A]: castle cary


[Q]: What was the name of Chuck Berry`s 1972 hit which gave him his first number one?
[A]: chuck berry


[Q]: On which horse did Tony McCoy win the 2010 Grand National on his 15th attempt?
[A]:
tony mccoy