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

In which Indian city is Eden Gardens, the second largest test cricket ground in the world?
eden gardens

Released last month, People, Hell and Angels is a posthumous album made up of songs recorded by which artist in 1969 ?
angel

What historic capital city is situated where the White Nile and Blue Nile join to form the southern start of the Nile?

blue nile