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
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? 
Select and explain. 
A. Intraductal papilloma, B. Breast cyst, C. Intraductal carcinoma, D. Carcinoma in situ
A: Intraductal papilloma
Answer: A: Intraductal papilloma 
Explanation: 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.