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

Zoey Barkow, Kevin Peyton, Eddie Walzer and Fitch Cooper are all characters in which US television series?
merritt wever

To which country do the Chatham Islands belong?
chatham islands

What is the name of the teletext information service started by the BBC in September 1974?

bbc