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

Example Input: In which opera does a hunchback jester help his master, the Duke of Mantua, to seduce the daughter of a courtier?
Example Output: duke of mantua

Example Input: Which American actor and singer has joined Amanda Holden as one of the judges on the current series of 'Britain's Got Talent'?
Example Output: britain's got talent

Example Input: The Card Players and The Boy in the Red Vestare are works by which 19th century French artist?
Example Output:
the card players