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': 'High-risk breast cancer female investigation of choice is? \nSelect and explain. \nA. MRI, B. USG, C. Mammography, D. Clinical examination', 'role': 'user'}, {'content': 'Answer: A \nExplanation: – To differentiate scar from recurrence.\n– To image breasts of women with implants.\n– To evaluate the management of axilla and recurrent disease.\n\nIt is useful in screening females with the high-risk group.\nT1 and T2 weighted images are taken.\nIrregular mass with speculations, changes in skin and nipple, lymphoedema are the findings in carcinoma breast.\n\nMRI breast is not accurate if done within 9 months of the radiotherapy in carcinoma of the breast.\xa0\nBoth precontrast and postcontrast MRI are done.', 'role': 'assistant'}]