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

Ex Input:
Which 1995 'Space' move starred Tom Hanks; Bill Paxton and Kevin Bacon?

Ex Output:
tom hanks


Ex Input:
Who directed the film Black Swan (in ballet)?

Ex Output:
black swan


Ex Input:
What did Carlton Magee devise in the US for motorists?

Ex Output:

carl magee