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

Ex Input:
Charlie Chaplin who died on Christmas Day in 1977, co founded which film studio along with Mary Pickford, Douglas Fairbanks?

Ex Output:
douglas fairbanks

Ex Input:
Who played Bonnie in the 1967 film 'Bonnie And Clyde'?

Ex Output:
bonnie and clyde

Ex Input:
Which American football team did David Beckham sign up to in 2007?

Ex Output:
david beckham