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': 'Current gold standard to detect ductal carcinoma in situ breast is: \nSelect and explain. \nA. Mammography, B. MRI, C. USG, D. CT/PET', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. MRI', 'role': 'assistant'}]