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': "True about Paget's disease of the nipple is: \nSelect and explain. \nA. Always there is underlying carcinoma, B. Often bilateral eczema of nipple seen, C. Histology reveals giant cells, D. Highly malignant", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Always there is underlying carcinoma)Ref: Bailey & Love, 24th ed, p. 837 & 23rd ed, p. 762, Schwartz surgery, 7th ed, p. 564', 'role': 'assistant'}]