TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Denzil Washington played which black militant leader in the 1992 film of the same name?

SOLUTION: denzel washington

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

SOLUTION: highway 61 revisited

PROBLEM: Name the lake in Ethiopia which is the source of the Blue Nile?

SOLUTION:
blue nile