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 engineer built the Menai Suspension Bridge and the Caledonian Canal?

SOLUTION: menai suspension bridge

PROBLEM: The French wine growing areas of Macon, Beaujolais and Chablis are in which region?

SOLUTION: macon

PROBLEM: What was Buddy Hollies current single when he died?

SOLUTION:
buddy holly