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

Example 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?
Example Output: russian revolution

Example Input: With eight goals which Barcelona player was the leading scorer in the 2009-10 Champions League?
Example Output: barcelona

Example Input: Who played Lieutenant Colonel Nicholson in the 1957 film 'The Bridge on the River Kwai'?
Example Output:
the bridge on the river kwai