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:
Chelsea won the 2009 FA Cup final 2-1.  Who were the beaten finalists?
answer:
2009 fa cup final


question:
In 1919, which Dadaist created L.H.O.O.Q., a parody of the Mona Lisa, in which a moustache and goatee beard were added to a reproduction of the painting?
answer:

dada