Which is NOT a unit of measure in the apothecary system?

The apothecary system is a historical system of measurement that was primarily used by pharmacists and in medicine before the metric system became more widely adopted. It includes specific units that are unique to this system.

In the apothecary system, common units of measure include the pound, scruple, and fluid ounce, all of which have defined values specific to this system. The pound is a unit of weight, the scruple is a smaller unit of weight (equal to 20 grains), and the fluid ounce measures volume.

The gram, however, is a unit of measure that belongs to the metric system, which is used globally today in scientific and medical contexts for its simplicity and standardization. Since the question asks for the option that is NOT a unit in the apothecary system, the gram is the correct answer because it does not belong to that historical framework of measurement.