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

What name is given to the disease whereby parasites can change the behaviour of rats and mice, making them drawn to rather than fearful of the scent of cats?
cat

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

In the tv show Charmed, what was the name of the eldest sister (played by Shannen Doherty) who was killed off at the end of Season 3?

charmed