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: What are Proxima Centauri, Sirius A, Pollux, Arcturus and Betelgeuse?

Output: arcturus


Input: Consider Input: More familiar for television roles, who played King Edward the First in the film Braveheart?


Output: braveheart