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': 'Xeroradiography is used in... cancer detection. \nSelect and explain. \nA. Stomach, B. Breast, C. Colonic, D. Pancreatic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Breast', 'role': 'assistant'}]