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

Input: Consider Input: 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?

Output: russian revolution

Input: Consider Input: Ride of the Valkyries is the official quick march of which branch of the British Army?

Output: british army

Input: Consider Input: What 2013 film is the highest-grossing animated movie of all-time?
Output: animation