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

[EX Q]: Who was Minister-Chairman of the Russian Provisional Government and Prime Minister of Russia from 21 July 1917 (following the abdication of Tsar Nicholas II) to 8 November 1917 (the Bolshevik revolution), who is buried in Putney Vale Cemetery, London?
[EX A]: russian revolution

[EX Q]: To which country do the Chatham Islands belong?
[EX A]: chatham islands

[EX Q]:  '2 Become 1', 'Say You'll Be There' and 'Viva Forever' were all number one hit singles by which British group?
[EX A]:
2 become 1