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: Surgery
[{'content': 'Ring sequestrum is seen in \nSelect and explain. \nA. Typhoid osteomyelitis, B. Chronic osteomyelitis, C. Amputation stump, D. Tuberculosis osteomyelitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Amputation Stump Excessive periosteal stripping is contraindicated as it may result in formation of ring sequestrum in amputation stumpQType of Sequestrum Found InRing sequestrum - Amputation stumpsQ - Around pin tracks (external fixator)Tubular sequestrum - Hematogenous osteomyelitis - Segmental fractures (middle segment)Rice grain sequestrum - Tuberculosis', 'role': 'assistant'}]