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

Which was the title of the 7th and final book in the Chronicles of Narnia by C.S. Lewis?
the chronicles of narnia

In which British city would you find Barlinnie prison?
hm prison barlinnie

He is an alpine ski racer, who won four overall World Cup titles (1998, 2000, 2001, 2004), two Olympic gold medals (in 1998), and three World Championship titles (1999, 1999 and 2005). Who is he?

alpine skiing