This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries Around Arm & Elbow, 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: Ans. is 'c' i.e., Chronic Osteomyelitis Amputation is performed in chronic Osteomyelitis, very rarely; in a case with a long standing discharging sinus, especially if the sinus undergoes a malignant change.", 'role': 'assistant'}]