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: Pathology
[{'content': "Paget's disease of breast indicative of \nSelect and explain. \nA. Ductal carcinoma, B. Lobular carcinoma, C. Papillary carcinoma, D. Medullary carcinoma", 'role': 'user'}, {'content': "Answer: A \nExplanation: A. i.e. (Ductal carcinoma) (790 - Harsh mohan 5th) (745 Basic pathology 8th)* ** Invasive ductal carcinoma is the most common carcinoma of the breast* **Upper outer quadrant is most common site (left side is more common)PAGET'S DISEASE OF THE NIPPLE - is an eczematous lesion of the nipple associated with invasive or non invasive ductal carcinoma of the under lying breast* Prognosis is based on the underlying carcinoma and is not worsened by the presence of pagets disease **** Atypical epithelial hyperplasia is associated with malignancy of breast** Fibroadenoma is most common benign neoplasm of the female breast* Marker of Paget's disease of the mammary gland is CA - 15 - 3, CEA**", 'role': 'assistant'}]