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Final answer:The excision of a necrosed bone is called sequestrectomy.Explanation:The correct answer is option 3) sequestrectomy.Sequestrectomy refers to the surgical removal of a necrosed bone. Necrosis is the death of living cells or tissues due to disease, injury, or lack of blood supply. In the case of a necrosed bone, the affected bone tissue needs to be excised to prevent further complications and promote healing.For example, if a bone becomes necrosed due to a severe infection or trauma, a sequestrectomy may be necessary to remove the dead bone tissue and facilitate the regeneration of new healthy bone....