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

Angel Clare is a character in which novel by Thomas Hardy?
angel clare

Which British Prime Minister, born in Chelsea in February 1894, died on December 29th 1986 aged 92 ?
chelsea