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

Example Input: On which date do we celebrate 'Boxing Day'?
Example Output: boxing day

Example Input: In which film of 1995 did Robert De Niro and Al Pacino appear on screen together for the first time?
Example Output: al pacino

Example Input: The 2007 film 'Cinderella Man' is a biopic of which boxer?
Example Output:
cinderella man