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

[EX Q]: Which jockey rode Red Alligator to victory in the 1968 Grand National?
[EX A]: red alligator

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

[EX Q]: Whose debut album Rockferry was the bestselling UK album of 2008?
[EX A]:
album