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

[EX Q]: Created by Alex Raymond, this futuristic character first appeared in 1934. Who is he?
[EX A]: alex raymond

[EX Q]: Which composer was married to Clara Wieck from 1840 until his death in 1856?
[EX A]: clara schumann

[EX Q]: Who played the joker in the 2008 film The Dark Knight?
[EX A]:
the dark knight