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

What is the Army equivalent to a Group Captain in the R.A.F.?
british army

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

Which model was engaged to Bryan Ferry of Roxy Music before she married Mick Jagger?

bryan ferry