In the formula D/H 3 Q 5 X, the X stands for:

A. dosage unit
B. dose on hand
C. unit of measure
D. the number of units the desired dosage will be contained in

d
Rationale: In this formula, the "X" stands for the number of capsules (or other units) that the desired dosage (D) will be contained in. This is also known as the "amount to be administered."