A 50-year old man has been taking prednisone (Deltasone) following a severe reaction to poison ivy. He notices that the dosage of the medication decreases. During a follow-up office visit, he asks the nurse why he must continue the medication and why he cannot just stop taking it now that the skin rash is better. What is the nurse's best response?
a. "Sudden discontinuation of this medication may result in adrenal insufficiency."
b. "You would experience withdrawal symptoms if the drug were discontinued abruptly."
c. "Cushing's syndrome may develop as a reaction to a sudden drop of serum cortisone levels."
d. "You can stop taking the medication if his rash is better."