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: Unknown
[{'content': 'Which structures are preserved in Scanlon’s modified radical mastectomy ? \nSelect and explain. \nA. Lateral pectoral nerves, B. Level II nodes in the axilla, C. Pectoral fascia, D. Nipple and the areola', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Modified Radical Mastoidectomy (MRM) : 2 types –\nAuchincloss MRM : Both pectoralis major and minor are preserved with removal of level I and II axillary nodes only.\nPatey’s MRM : Pectoralis minor is removed with complete axillary clearance of nodes up to level III. - Scanlon’s modification of Patey’s MRM : Instead of removing pectoralis minor, the muscle is just divided to that level 3 nodes can be removed.', 'role': 'assistant'}]