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: A CAST OF THOUSANDS 
Clue: It's what you're trying to catch when you're fly-casting

SOLUTION: fish

PROBLEM: Category: CAN'T BE ON JEOPARDY! 
Clue: These numbskulls that were thorns in the side of Gumby just won't cut it

SOLUTION:
blockheads