instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What was Casanova's occupation at the time of is death?
answer:
giacomo casanova


question:
Mar Chiquita (Cordoba) is the largest natural salt lake in which South American country?
answer:
mar chiquita lake


question:
In which country was Antonio Vivaldi born?
answer:

antonio vivaldi