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.
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Question: Category: JON STEWART'S AMERICA 
Clue: This 1215 document "served as a wake-up call that Europe would be forced to answer...in about 500 years"

Answer: the magna carta


Question: Category: LESSER-KNOWN PROVERBS 
Clue: It specifically "tries truth" as well as generally "tries all things"

Answer: time


Question: Category: SYSTEM OF A "DOWN" 
Clue: When you descend a steep grade, it helps to do this instead of braking to save wear on your car's brakes

Answer:
downshift