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

In March 1992 'Deeply Dippy' was the only number one hit for which group?
deeply dippy

Which legal drama starring Martin Shaw ran for six series on BBC TV from 2001?
martin shaw

Who played 'Captain Corelli' in the film 'Captain Corelli's Mandolin'?

captain corelli's mandolin