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: POTPOURRI 
Clue: Imported into Brazil from Africa, these "killer" insects escaped the lab & bred with locals

SOLUTION: bees

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: MUSEUMS 
Clue: The National Museum of American History is just one part of this Washington, D.C. institution

SOLUTION:
smithsonian