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: Orthopaedics
[{'content': "Amputation is often not required in - \nSelect and explain. \nA. Gas gangrene, B. Buerger's, C. Chronic osteomyelitis, D. Diabetic gangrene", 'role': 'user'}, {'content': "Answer: C \nExplanation: Amputation may, very rarely, be preferred in a case with a long-standing discharging sinus, especially if the sinus undergoes a malignant change.\n\nAmputation \n\nAmputation is a procedure where a part of the limb is removed through one or more bones.\nDisarticulation is a procedure where the limb is removed through a joint.\nIndications of amputation\nIndications of amputations may be absolute or relative :-\n\nA) Absolute indications\n\nGas gangrene\nDiabetic gangrene\nIrreparable loss of blood supply due to trauma or disease\nPeripheral vascular disease (Burger's gangrene)\n\nB) Relative indications\n\nTrauma\nTumors\nSevere loss of function of limb\nNerve injuries\nCongenital anomalies\n\n\nOverall most common cause of amputation is trauma (injury) to a limb.", 'role': 'assistant'}]