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: HISTORIC QUOTES 
Clue: This great Prussian king is credited with saying, "An army, like a serpent, travels on its belly"

A: frederick the great
****
Q: Category: VOYEUR INFORMATION 
Clue: Catch a glimpse of the footprint seen here & you're treading around this location where it was made

A: the moon
****
Q: Category: FILE UNDER "O" 
Clue: This state's flag includes the design seen here

A:
oklahoma
****