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

Ex Input:
Who was in the films Zelig, Stardust Memories, and Broadway Danny Rose?

Ex Output:
broadway danny rose

Ex Input:
What horse won the 2009 Grand National?

Ex Output:
2009 grand national

Ex Input:
In which 1992 film does the character Catherine Tramell appear?

Ex Output:
catherine tramell