instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
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?
answer:
byzantine empire


question:
Which American city has baseball-playing 'Dodgers'?
answer:
los angeles dodgers


question:
Deoxyribonucleic acid is commonly known as what?
answer:

deoxyribonucleic acid