instruction:
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.
question:
Category: U.S. PRESIDENTS
Clue: Washington was the one who added these 4 words to the presidential oath; they're not in the Constitution
answer:
"so help me god"

question:
Category: SIGNS & SYMBOLS
Clue: Created in 1970 & made up of 3 arrows, the universal symbol for this was based on the Mobius strip
answer:
recycling

question:
Category: THE SPACE PROGRAM
Clue: In 1979 NASA officials received a fine for littering from a small town in this country
answer:
australia