instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which Frenchman composed Clair de lune, the famous third movement of Suite bergamasque?
answer:
suite bergamasque


question:
Which major river has its source at the confluence of the rivers Brigach and Breg in the Black Forest?
answer:
breg


question:
which famous person invented the cat flap?
answer:

pet door