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

What is a variation of the standard card game of poker which consists of two cards being dealt face down to each player and then 5 community cards being placed by the dealer (3 as the flop then 1 called the turn, then 1 called the river), with players having the option to check, bet or fold after each deal?

community card poker