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: Pathology
[{'content': 'Involucrum means - \nSelect and explain. \nA. Dead bone, B. New living bone, C. Previous living bone, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In osteomyelitis:-\n\nSequestrum → The Dead piece of bone.\nInvolucrum Reactive woven or lamellar bone around sequestrum.', 'role': 'assistant'}]