The Nurse Appreciates the Principal Advantage in Using Patient-Controlled Analgesia

The nurse appreciates the principal advantage in using patient-controlled analgesia (PCA) is that it:

A) reduces patient anxiety about pain by giving the patient more control in its management.
B) reduces the workload of the nurse, because it does not have to be checked often.
C) eliminates the risk of adverse drug effects from the medication.
D) completely eliminates any pain the patient is experiencing.