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

[EX Q]: Which English classic horse race for 3 year olds held at Doncaster every September began in 1776?
[EX A]: doncaster racecourse

[EX Q]: The Byzantine Empire is the term used since the 19th century to describe the Roman Empire of the Middle Ages, centred on its capital, where?
[EX A]: byzantine empire

[EX Q]: What is the name of the largest lake lying wholly in Canada?
[EX A]:
canada