TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What famous song from the film Butch Cassidy and the Sundance Kid won an Oscar for best song?

SOLUTION: academy award for best original song

PROBLEM: In which country are the Angel Falls, or Kerepakupai Ven?

SOLUTION: angel falls

PROBLEM: The Bridal Chorus AKA 'Here comes the Bride' appears in which opera by Wagner?

SOLUTION:
bridal chorus