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

[EX Q]: Who wrote `20,000 Leagues Under The Sea`?
[EX A]: 20,000 leagues under the sea

[EX Q]: Which Chuck Berry song is performed by Marty McFly at the end of the film Back to the Future?
[EX A]: back to the future

[EX Q]: Amy Winehouse and the brand of which famous 1930s sportsman announced a joint collection in 2010?
[EX A]:
amy winehouse