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

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

Forty hours before he committed suicide in 1945 Adolf Hitler married whom?
adolf hitler

What movie star was nominated for acting awards for playing Anna Christie in 1930 and Anna Karenina in 1935?

anna christie