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

[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]: Which boxer won a 1.8m claim against promotor Frank Warren in March 2009?
[EX A]: boxing

[EX Q]: Chep Lap Kok airport is located where?
[EX A]:
hong kong international airport