This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Anatomy
[{'content': 'On mammogram all of the following are the features of a malignant tumor except \nSelect and explain. \nA. Spiculation, B. Microcalcification, C. Macrocalcification, D. Irregular mass', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mammographic features suggestive of breast cancer A solid mass with or without stellate features Asymmetric thickening of breast tissues Clustered microcalcification Presence of fine, stippled calcium in and around a suspicious lesion is suggestive of breast cancer and occurs in as many as 50% of nonpalpable cancers These microcalcifications are especially impoant sign of cancer in younger women, in whom it may be the only mammographic abnormality Ref:Sabiston 20th edition Pgno : 828', 'role': 'assistant'}]