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

Ex Input:
Who composed the opera 'Albert Herring' in 1947?

Ex Output:
albert herring


Ex Input:
Feb 15, 1564 saw the birth of what famed Italian physicist, mathematician, astronomer, and philosopher, who discovered the first 4 moons of Jupiter?

Ex Output:
astronomer


Ex Input:
With what instrument are Charlie Christian, Les Paul, Tiny Grimes, Barney Kessel, Herb Ellis, Jimmy Raney, Tal Farlow, Kenny Burrell, Grant Green, Wes Montgomery, and Jim Hall associated?

Ex Output:

kenny burrell