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: FAMOUS AMERICANS 
Clue: In part, using donated French tanks, he formed the U.S. Army's first tank training school in 1917
answer:
george patton


question:
Category: U.S. CITIES 
Clue: Its largest airport is named for a World War II hero; its second largest, for a World War II battle
answer:
chicago


question:
Category: METALS 
Clue: Element No. 79, it's estimated that all of it ever mined would only make a cube about 50 feet across
answer:

gold