This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: X-RAYS, Subject name: Radiology
[{'content': 'Which of the following features suggesting malignant lesion on mammography? \nSelect and explain. \nA. Round well defined borders, B. Macrocalcifications, C. Microcalcifications, D. Fat content', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Microcalcifications are suggestive of a malignant lesion. Macrocalcification/ Popcorn calcifications are fibroadenomas which are benign lesions The pattern and shape of microcalcifications can also give radiologists clues about whether cancer may be present. Linear, rod-like calcifications raise suspicion of underlying breast cancer, whereas popcorn, eggshell, and rim-like calcifications are usually benign.', 'role': 'assistant'}]