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: Pathology
[{'content': 'Brachytherapy means \nSelect and explain. \nA. Chemotherapy, B. Radiation administered interstially through catheters, C. Lasers, D. Radiation involving normal tissues', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]