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': 'All are indicators of malignancy in a mammography except - \nSelect and explain. \nA. Nodular cacification, B. Speckled margin, C. Attenuated architecture, D. Irregular mass', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer (a) Nodular calcification', 'role': 'assistant'}]