TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which rank of the peerage is directly below a duke?

SOLUTION: duke

PROBLEM: Pirate Edward Teach was better known by what nickname?

SOLUTION: edward teach

PROBLEM: The Battle of Hamel took place in which country during World War I?

SOLUTION:
battle of hamel