Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Input: Consider Input: Double vision, the perception of two images from a single object, is properly called what?

Output: double vision


Input: Consider Input: Who did boxer Floyd Patterson defeat to regain the Heavyweight Championship in June 1960?

Output: boxing


Input: Consider Input: Who wrote the musicals Annie get your Gun and Call Me Madam?


Output: annie get your gun