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': 'Beams can be used for cancer treatment are \nSelect and explain. \nA. g-rays, B. a-rays, C. Neutrons, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Gamma rays; B i.e. a-rays; C i.e. Neutron', 'role': 'assistant'}]