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': 'Using a small fine probe single lactiferous duct is excised.  What is the name of the procedure: \nSelect and explain. \nA. Microdochectomy, B. Macrodochectomy, C. Hadfield operation, D. Webster operation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Sabiston Textbook of Surgery. Pg. 837\n\xa0\n\nMicrodoectomy is the excision of single lactiferous duct\nHadfield operation is central duct excision which is surgical removal of all lactiferous ducts under the nipple\n\n\nIt is done in Mammary duct ectasia (periductal mastitis)', 'role': 'assistant'}]