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

[Q]: In which Indian city is Eden Gardens, the second largest test cricket ground in the world?
[A]: eden gardens


[Q]: Who was British Prime Minister from 1922-23, shortly before he died?
[A]: prime minister of the united kingdom


[Q]: Who had a hit single with 'Crocodile Rock`'n 1972?
[A]:
crocodile rock