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

Who has taken over the TV role of Doctor Who, from actor David Tennant?
doctor who

Which pop group consisted of Huw Bunford, Clan Caren, Dafydd Leuan, Guto Price and Gryff Rhuys?
huw bunford

Burl Ives played Big Daddy in the original 1955 Broadway cast of which play?

big daddy