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: Pathology
[{'content': 'The type of mammary ductal carcinoma in situ (DCIS) most likely to result in a palpable abnormality in the breast is: \nSelect and explain. \nA. Apocrine DCIS, B. Neuroendocrine DCIS, C. Well differentiated DCIS, D. Comedo DCIS', 'role': 'user'}, {'content': "Answer: D \nExplanation: Before the use of screening mammography, ductal carcinoma in situ (DCIS) typically presented as a palpable mass or nipple discharge. Ref: Robbin's Basics of Pathology , 7th Edition, Page I139; Management of Breast Diseases By Ismail Jatoi, Manfred Kaufmann, 2010, Page 206; Perez and Brady's Principles and Practice of Radiation Oncology By Edward C. Halperin, Carlos A. Perez, Luther W. Brady, 2008, Page 438.", 'role': 'assistant'}]