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

Example Input: Dora Maar au Chat and The Weeping Woman are both portraits by which artist of his lover?
Example Output: dora maar au chat

Example Input: 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?
Example Output: byzantine empire

Example Input: What is the name of the co-founder of Apple Computers who died in October 2011?
Example Output:
apple inc.