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: Surgery
[{'content': 'The commonest type of ca breast is - \nSelect and explain. \nA. Papillary ca, B. Pagets disease, C. Fibrasorcoma, D. Infiltrative ductal ca', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]