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
Involucrum means - 
Select and explain. 
A. Dead bone, B. New living bone, C. Previous living bone, D. None of the above
B: New living bone
Answer: B: New living bone 
Explanation: In osteomyelitis:-

Sequestrum → The Dead piece of bone.
Involucrum Reactive woven or lamellar bone around sequestrum.