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

Example Input: Which exponent of Brit Art created works involving a bed, a tent and a beach hut?
Example Output: young british artists

Example Input: Which English king was married to Eleanor of Castile?
Example Output: eleanor of castile

Example Input: Which 1967 Beatles song contains the lines On the corner is a banker with a motor car; the little children laugh at him behind his back?
Example Output:
the beatles