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: Medicine
[{'content': 'Life threatening complications of diabetes mellitus are all except - \nSelect and explain. \nA. Malignant otitis externa, B. Rhinocerebral mucormycosis, C. Emphysematous pyelonephritis, D. Emphysematous appendicitis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans is option 4 - Emphysematous appendicitis It is not a fatal complication of DM. malignant otitis externa or invasive or necrotising otitis externa is life threatening in elderly diabetic and immunocompromised patients. Rhinocerebral mucormycosis is a life threatening fungal infection develops in DM patients. Emphysematous pyelonephritis is rapidly progressing with accumulation of fermentive gases in kidney and perinephritic tissues and life threatening. Ref Harrison 16/ 186, 189,1720', 'role': 'assistant'}]