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

Example Input: Who played Bonnie in the 1967 film `Bonnie And Clyde`?
Example Output: bonnie and clyde

Example Input: What book was written by Alexandre Dumas about Edmond Dantes' imprisonment in the Chateau d'If?
Example Output: alexandre dumas

Example Input: Formerly known as Sky Dome, Rogers Centre is home to what American League baseball team, the only MLB team located outside the United States?
Example Output:
american league