This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Surgery
[{'content': "A 36-year-old woman complains of a 3-month history of bloody discharge from the nipple. At examination, a small nodule is found, deep to the areola. Careful palpation of the nipple- areolar complex results in blood arrearing at the 3 O'clock position. Mammogram findings are normal. What is the likeliest diagnosis? \nSelect and explain. \nA. Intraductal papilloma, B. Breast cyst, C. Intraductal carcinoma, D. Carcinoma in situ", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Intraductal papilloma is the most common cause of bloody discharge from the nipple. The lesion is treated by excision and is benign in most cases. Cancer is present in 5% of cases. Preoperative ductography can be used to help locate the offending duct.', 'role': 'assistant'}]