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: Radiology
[{'content': 'Best imaging modality in patients with breast implants is: \nSelect and explain. \nA. MRI scan, B. CT scan, C. Mammography, D. Radionuclide scan', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. MRI scan', 'role': 'assistant'}]