Answer :
Final answer:
The basic unit of mass in the apothecaries' system of measurement, which is still occasionally used in medicine, is the grain. This system has largely been replaced by the metric system. One grain equals about 64.8 milligrams.
Explanation:
In the apothecaries' system of measurement, the basic unit of mass is the grain (D). The apothecaries' system is an old system of mass and volume used by pharmacists and physicians. Its use began to decline with the introduction of the metric system.
However, some units from the apothecaries' system, such as grains, are still used in medicine today. One grain is approximately equal to 64.8 milligrams in the metric system. It's important to be aware of this older system in fields like medicine due to its continued, albeit limited, usage.
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