This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adrenal Gland, Subject name: Pathology
[{'content': "The most common cause of Addison's disease is: \nSelect and explain. \nA. Autoimmune adrenalitis, B. Meningococcal septicemia, C. Malignancy, D. Tuberculosis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary Chronic Adrenocoical Insufficiency (Addison Disease) Uncommon disorder resulting from progressive destruction of the adrenal coex More than 90% of all cases are attributable to one of four causes: Autoimmune adrenalitis Accounts for 60% to 70% of cases; it is by far the most common cause of primary adrenal insufficiency in developed countries Infections Paicularly tuberculosis and those produced by fungi- histoplasmosis, AIDS Tuberculous adrenalitis, which once accounted for as much as 90% of cases of Addison disease, has become less common with the development of antituberculous agents Genetic conditions - Adrenogenital syndromes Metastatic cancers.', 'role': 'assistant'}]