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: WHAT SHOULD I "DU"?
Clue: A philosophical system that seeks to explain all phenomena in terms of 2 distinct principles

SOLUTION: dualism

PROBLEM: Category: OSCAR WORTHY?
Clue: Diedrich Bader voiced Oscar, a saber-tooth in this 2002 animated film

SOLUTION: ice age

PROBLEM: Category: IT'S ALL YOUR FAULT
Clue: This 10,000-mile-long sub-oceanic "ridge" has its faults -- there's one every 20 to 60 miles

SOLUTION:
mid-atlantic ridge