TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: In which city could you visit the Anne Frank House?

SOLUTION: anne frank house

PROBLEM: In 2011, Christian Bale won a Best Supporting Actor Oscar for his role as an assistant to his half-brother in which boxing related film?

SOLUTION: christian bale

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

SOLUTION:
highway 61 revisited