What Action Is Most Important for the Nurse to Teach

What action is most important for the nurse to teach the patient taking corticosteroids following a transplant?

A) "Combining the steroid with certain antibiotics can increase the risk of cardiac arrhythmias."
B) "While side effects are expected with the medication, none is life-threatening."
C) "Be sure to get all immunizations as recommended."
D) "You need to avoid pregnancy while taking this steroid."