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

Ex Input:
Which actor spoke the line I love the smell of napalm in the morning* in the 1979 film Apocalypse Now?

Ex Output:
apocalypse now

Ex Input:
Which cyclist won the first medal for Team GB at the 2012 Olympic Games?

Ex Output:
gb

Ex Input:
Who played Sam 'Ace' Rothstein in the 1995 film 'Casino'?

Ex Output:
casino