instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which entertainer uses various names, including Puff Daddy, P. Diddy and Diddy?
answer:
p. diddy

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

question:
Andalusia, Catalonia, Galicia, Aragon, Castilla y Len, Castile-La Mancha, and Extremadura are autonomous communities in which nation?
answer:
castile