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: On November 22, 1986, which boxer became the youngest WBC Heavyweight champion, at age 20 years, 4 months, when he scored a TKO over Trevor Berbick in the second round?

SOLUTION: boxing

PROBLEM: Big Boi and Andre 3000 are members of what rap group?

SOLUTION:
big boi