TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Double vision, the perception of two images from a single object, is properly called what?

SOLUTION: double vision

PROBLEM: Who was the only British medal winner at the 2010 Winter Olympics?

SOLUTION: 2010 winter olympics

PROBLEM: In the movie The Avengers, which superhero uses a bow and arrow?

SOLUTION:
avengers