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

I which European city will you find 'Dam Square'?
dam square

What book was written by Alexandre Dumas about Edmond Dantes' imprisonment in the Chateau d'If?
alexandre dumas

In which African country does 100 pesetas equal 1 cedi?

ghanaian cedi