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': 'For which malignancy, Intensity Modulated Radiotherapy (IM) is the most suitable: \nSelect and explain. \nA. Lung, B. Prostate, C. Leukemias, D. Stomach', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Prostate', 'role': 'assistant'}]