You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

[Q]: Category: NOTED BLACK AMERICANS 
Clue: This big band leader won 3 Grammys for his work on the 1959 courtroom drama "Anatomy of a Murder"
[A]: duke ellington


[Q]: Category: BLACK IS BACK 
Clue: The "Black Spot" is a dreaded summons handed out by pirates in this 1883 Robert Louis Stevenson tale
[A]: treasure island


[Q]: Category: THE BRAIN 
Clue: There are over 10 billion of these cells in the brain, each part of the brain having its own type
[A]:
neurons