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

[Q]: The Greeks called her Athena, what was the Roman name for this Goddess?
[A]: athena


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


[Q]: In which Dickens novel do the characters 'Gaffer Hexam', 'John Harmon', and 'Bradley Headstone'?
[A]:
charles dickens