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: WHAT'S THE BIG IDEA? 
Clue: The 21st century doctrine named for this man allows the U.S. to wage preventive war if an attack on us is coming

Answer: george w. bush


Question: Category: ANIMAL PLANET? 
Clue: In gymnastics, it's safe to vault over; its body is upholstered

Answer: horse


Question: Category: "Y"s UP 
Clue: It's right below Saudi Arabia

Answer:
yemen