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: In the British Army, what rank falls between Major General and Colonel?

SOLUTION: british army

PROBLEM: Which singer released the albums Aladdin Sane in 1973 and Let's Dance in 1983?

SOLUTION:
let's dance