TASK DEFINITION: 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.
PROBLEM: Category: PAINTERS 
Clue: His grandson was the cinematographer of "Barbarella" & "The Spy Who Loved Me"

SOLUTION: pierre auguste renoir

PROBLEM: Category: SPORTS CHAMPIONS 
Clue: Winning in 1965 & 1966, he was the first man to win the Masters golf tournament in 2 consecutive years

SOLUTION: jack nicklaus

PROBLEM: Category: OPERATIC TITLE CHARACTERS 
Clue: These title characters of a classic operatic work are a bunch of mythical dwarves

SOLUTION:
the nibelung