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.

Category: "E" GADS! 
Clue: In 1986 they became the first siblings inducted into the Rock & Roll Hall of Fame
the everly brothers

Category: FISH, BIRD, OR MAMMAL 
Clue: The colobus
mammal

Category: FROM THE GREEK 
Clue: Greek for "overseer" gives us this chess piece big on 45-degree angles

the bishop