This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Adrenal Gland, Subject name: Medicine
[{'content': 'What is the leading cause of adrenal insufficiency? \nSelect and explain. \nA. Autoimmune adrenalitis, B. TB of adrenals, C. X- linked Adreno leukodystrophy, D. Hypothalamic pituitary disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: This is a closely worded question Please note that incidence of Secondary adrenal insufficiency is MORE common than primary adrenal insufficiency. The most common cause of secondary adrenal insufficiency is hypothalamic pituitary insufficiency. Most common cause of primary adrenal insufficiency is Autoimmune Adrenalitis.', 'role': 'assistant'}]