TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: 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?

SOLUTION: byzantine empire

PROBLEM: The town of Anthony in which US state was known as 'The Leap Year Capital of the World'?

SOLUTION: united states

PROBLEM: Who wrote the novels Rosemary's Baby, The Stepford Wives and The Boys from Brazil?

SOLUTION:
the boys from brazil