This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
The most common cause of Addison's disease is - 
Select and explain. 
A. Autoimmune adrenalitis, B. Meningococcal septicemia, C. Malignancy, D. Tuberculosis
A: Autoimmune adrenalitis
Answer: A: Autoimmune adrenalitis 
Explanation: Most common cause (60%-70%) of primary adrenocorticol insufficiency (Addison'discases) is autoimmune adrenelitis.
Other common cause are.

Tuberculosis → Most common cause of Addison's disease in India.
AIDS
Metastatic cancers