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

What was Casanova's occupation at the time of is death?
giacomo casanova

Which two brothers had hits with Cathy's Clown and Wake Up Little Susie?
cathy's clown

Which Welsh author, born in Cardiff, has written over 30 books, including Pillars of the Earth, Fall of Giants and Capricorn One?

capricorn one