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

[EX Q]: Which legal drama starring Martin Shaw ran for six series on BBC TV from 2001?
[EX A]: martin shaw

[EX Q]: What breed of dog is Marmaduke in the newspaper cartoon strip of that name?
[EX A]: dog

[EX Q]: In Egyptian mythology, the brother of Horus and Isis, who was the god of storms, and often represented as a hippopotamus?
[EX A]:
egyptian mythology