Each one of the following options consists of pairs of words. Choose the best pair to match with the pair in the question.
Doctor : Nurse

The relationship in "Doctor : Nurse" is professional hierarchy/assistance where a Doctor is the main skilled professional in a workplace (hospital) and a Nurse assists them or carries out complementary execution. Similarly, a Chef is the main professional in a kitchen (restaurant) who prepares food, and a Waiter manages the complementary frontline execution/service.