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: LET'S GET IT "ON"! 
Clue: A person of low social status, or a day laborer

SOLUTION: peon

PROBLEM: Category: C PLUS 
Clue: C plus a cry of pain equals this, a sofa

SOLUTION: couch

PROBLEM: Category: WE THREE KINGS 
Clue: Of Ivan the Terrible, Peter the Great or Nicholas II, the one ruling when Ben Franklin was born

SOLUTION:
peter the great