TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: 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?

SOLUTION: russian revolution

PROBLEM: What is the largest country in Africa?

SOLUTION: africa

PROBLEM: Who succeeded General Joseph Johnston as the Commander of the Army of Northern Virginia?

SOLUTION:
army of northern virginia