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

Example Input: Which Dutchman managed both Newcastle and Chelsea in the 1990s?
Example Output: chelsea f.c.

Example Input: Aragon and Castile joined to form which country?
Example Output: aragon

Example Input: The Bridal Chorus, more famous today as Here Come The Bride, comes from an Opera by which composer?
Example Output:
bridal chorus