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

[EX Q]: Allopurinol is typically prescribed for which illness?
[EX A]: allopurinol

[EX Q]: What is the title of the four-episode special of 'Doctor Who', made for the Red Nose Day telethon in the UK, broadcast in March 1999?
[EX A]: doctor who

[EX Q]: Which family live at 742 Evergreen Terrace?
[EX A]:
the simpsons house