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.

[Q]: Category: U.S. RIVERS 
Clue: The Falls of Saint Anthony stop this mighty river from being navigable north of St. Paul, Minnesota
[A]: the mississippi


[Q]: Category: WORDS FROM PLANETS 
Clue: The area for the orchestra on the biggest planet
[A]: a pit


[Q]: Category: 7-LETTER WORDS 
Clue: This adjective meaning rustic or pastoral comes from the Greek word for cowherd
[A]:
bucolic