题目内容

有关慢性骨髓炎死骨摘除的指征，下列哪项是恰当的

A. 慢性骨髓炎急性发作，并有死骨形成者
B. 有大块死骨形成，无死骨包壳者
C. 出现分离的死骨，有死腔和窦道，死骨形成包壳
D. 无窦道形成，有包壳出现

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