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.

Category: ASTRONOMY 
Clue: A galactic cloud of dust & gas, its name comes from the Latin for "cloud"
nebula

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

Category: TOOTSIE ROLLS 
Clue: We "fell" for these candies introduced in 2008; they're Tootsie Pops without the stick

tootsie pop drops