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: THE SOLAR SYSTEM 
Clue: The 2 planets in our solar system that have atmospheres made up mostly of carbon dioxide

Answer: venus & mars


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: HISTORIC LASTS 
Clue: In the "thanks a lot, fellas" department, Mongolia was the last country to join this group--August 9, 1945

Answer:
the allies