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------------------------------------------------ Which of the following measurements is used in the apothecary system for weight?

A. grain
B. milligram
C. gram

The measurement used for weight in the apothecary system is the grain. Unlike metric units such as milligram and gram, the grain is specific to the apothecary system. Thus, grain is the correct answer.

Explanation:

Understanding Apothecary Weight Measurements

The apothecary system is a traditional system of measurement that was commonly used in the field of medicine for weighing ingredients. In this system, the basic unit of weight is the grain, which is equivalent to approximately 64.8 milligrams. The milligram and gram are part of the metric system, which is not traditionally used in the apothecary system.

Comparison of Measurement Units

Grain: The smallest unit in the apothecary system.
Milligram: A metric unit, not used in the apothecary system.
Gram: A larger metric unit, also not used in the apothecary system.

Therefore, the answer to the question is grain, as it is the measurement used for weight in the apothecary system.

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