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

[EX Q]: Which major river has its source at the confluence of the rivers Brigach and Breg in the Black Forest?
[EX A]: breg

[EX Q]: What name is given to the disease whereby parasites can change the behaviour of rats and mice, making them drawn to rather than fearful of the scent of cats?
[EX A]: cat

[EX Q]: Who is the central character of Hilary Mantels Booker Prize winning novels Wolf Hall and Bring up the Bodies?
[EX A]:
wolf hall