instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Antanananarivo is the capitol of where?
answer:
antananarivo


question:
Which river begins in the Rocky Mountains in south-west Colorado, crosses New Mexico and forms the border between Mexico and the USA before reaching the Gulf of Mexico?
answer:
new mexico


question:
Which bass guitarist, songwriter, singer, and horn player, best known as part of The Who, died in June 2002?
answer:

french horn