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 consistency, answers should be in all lower cased letters.
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Question: Category: WORD ORIGINS 
Clue: This name for an earthenware beer mug is German for "stone"

Answer: stein


Question: Category: SHADES OF GREEN 
Clue: Introduced in 1993, the Crayola color named for this stalk veggie is more popular with kids than the real thing

Answer: asparagus


Question: Category: BASIC SCIENCE 
Clue: Nitrogen makes up around 78% of the atmosphere; this gas, only about 20%

Answer:
oxygen