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

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

Example Input: In which country was actor Basil Rathbone born?
Example Output: basil rathbone

Example Input: 'The Curse Of The Black Pearl' was the first of which series of films?
Example Output:
pirates of the caribbean: the curse of the black pearl