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

Abyssinian, British Longhair and German Rex are all breeds of what?
british longhair

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

Which writer was the father of Christopher Robin?

christopher robin milne