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

[EX Q]: Which model was married to photographer David Bailey for 10 years, from 1975?
[EX A]: david bailey

[EX Q]: Miss Rosa Dartle is a character in which Charles Dickens novel?
[EX A]: james steerforth

[EX Q]: Who directed the film Black Swan (in ballet)?
[EX A]:
black swan