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

SOLUTION: venus & mars

PROBLEM: Category: MOVIE MOUNTAINS 
Clue: This peak is featured in the 1959 Disney film "Third Man on the Mountain", where it's called "The Citadel"

SOLUTION: the matterhorn

PROBLEM: Category: U.S. CURRENCY 
Clue: Of men pictured on currently printed paper money, he's the one most recently deceased

SOLUTION:
ulysses s. grant