TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: The wine-producing region of Hunter Valley is in which Australian state?

SOLUTION: australia

PROBLEM: What is the Army equivalent to a Group Captain in the R.A.F.?

SOLUTION: british army

PROBLEM: What is the name of Moses and Aaron's sister?

SOLUTION:
aaron