Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Which engineer built the Menai Suspension Bridge and the Caledonian Canal?
menai suspension bridge

Name Alfred Hitchcock's first sound film as director?
alfred hitchcock

Who was the London-based Australian music impresario who managed John Leyton, Cream, Peter Frampton and The Bee Gees?

bee gees