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
Life threatening complications of diabetes mellitus are all except - 
Select and explain. 
A. Malignant otitis externa, B. Rhinocerebral mucormycosis, C. Emphysematous pyelonephritis, D. Emphysematous appendicitis
D: Emphysematous appendicitis
Answer: D: Emphysematous appendicitis 
Explanation: 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