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: Surgery
[{'content': "Surgery for periductal mastitis - \nSelect and explain. \nA. Hadfield's operation, B. Patey's mastectomy, C. Modified radical mastectomy, D. None of the above", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]