This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': "Which structures are preserved in scanlon's modified radical mastectomy \nSelect and explain. \nA. Lateral pectoral nerves, B. Level III nodes in axilla, C. Pectoral fascia, D. Nipple and the areola", 'role': 'user'}, {'content': "Answer: A \nExplanation: .* Scanlon's operation: Is a modified Patey's operation wherein instead of removing pectoralis minor, it is incised to approach the affected Level III lymph nodes.* Auchincloss modified radical mastectomy: Here pectoralis minor muscle is left intact and level III lymph nodes are not removed. ref:SRB's manual of surgery,ed 5,pg no 547", 'role': 'assistant'}]