TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What is the Army equivalent to a Group Captain in the R.A.F.?

SOLUTION: british army

PROBLEM: What was the name of the Prime Minister of Egypt who was assassinated in 1910?

SOLUTION: egypt

PROBLEM: Which river flows through the Grand Canyon in Arizona, USA?

SOLUTION:
arizona