This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
Drug causing Addison's disease is 
Select and explain. 
A. Ketoconazole, B. Aminoglutethimide, C. Cyclosporine, D. Glucocoicoids
A: Ketoconazole
Answer: A: Ketoconazole 
Explanation: Addison's disease, also known as primary adrenal insufficiency and hypocoisolism, is a long-term endocrine disorder in which the adrenal glands do not produce enough steroid hormones A dose dependent decrease in serum hydrocoisone due to synthesis inhibition is noted with the use of ketoconazole. others-mitotane, metyrapone, aminoglutethimide, etomidate (REF.Essential of medical pharmacology K D TRIPATHI 6 Edition, Page No - 763)