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: SEX CHANGES 
Clue: Don't let the pearls fool you, these lady bivalves can change into males when it suits them

SOLUTION: oysters

PROBLEM: Category: 1901-1910 
Clue: In 1909 Henry Ford produced over 10,000 of this car, saying customers could get it in "any color...so long as it is black"

SOLUTION: the model t

PROBLEM: Category: BODY LANGUAGE 
Clue: Compensation owed from an earlier time is this type of "pay"

SOLUTION:
back pay