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

Ex Input:
Who was re-elected Prime Minister of Canada in May 2011?

Ex Output:
prime minister of canada

Ex Input:
'Highway 61 Revisited' and 'Blood On The Tracks' were both albums released by which popular singer?

Ex Output:
highway 61 revisited

Ex Input:
Who succeeded Sir William Howe as Commander in Chief of the British forces in 1778 during the American War of Independence?

Ex Output:
american revolutionary war