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

Example Input: What was the last silent film in which Chaplin's little tramp appeared?
Example Output: chaplin

Example Input: The film The Curious Case of Benjamin Button, starring Brad Pitt, is based on a short story by whom?
Example Output: the curious case of benjamin button

Example Input: Who played the title role in the 1998 film Blade?
Example Output:
blade