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 consistency, answers should be in all lower cased letters.
PROBLEM: Category: "OO"!  "OO"! 
Clue: In a nursery rhyme this barnyard cry precedes "My dame has lost her shoe"

SOLUTION: "cock-a-doodle-doo"

PROBLEM: Category: BUSINESS & INDUSTRY 
Clue: This stagecoach company owned the Pony Express during the last few months of its existence

SOLUTION: wells fargo

PROBLEM: Category: INCREDIBLE EDIBLES 
Clue: Escoffier says these amphibians "Are not generally accepted as...first-class food by non-French people"

SOLUTION:
frogs