Answer :
In the field of Medicine, the effect of biological agents is often described using the term 'Unit.'
A biological agent's potency is determined by its biological activity, which can differ significantly from chemical or mass measurements. Biological agents like enzymes, hormones, and vaccines are typically measured in terms of activity units.
Unit (A):
- This term is used to express the amount of a substance based on its biological activity or effect. For example, the effect of a certain enzyme might be measured in units, indicating the amount needed to achieve a specific reaction under standardized conditions.
Milliequivalent (mEq):
- This is used in chemistry, often for ions in solution, not specifically for biological effects.
Milligram (mg) and Microgram (mcg):
- These are measures of mass. While they can also describe the quantity of certain biological substances, they are not used to directly indicate biological effect or potency.
In conclusion, when describing the effect of biological agents, 'Unit' is the most appropriate measurement. Thus, the correct option is A) Unit.