This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nuclear medicine, Subject name: Radiology
[{'content': 'Bragg peak effect is most noticable in ? \nSelect and explain. \nA. X ray, B. Proton, C. Neutron, D. Electron', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bragg peak effect Pronounced for protons Proton therapy targets tumors inside the body, spares the healthy cells Bragg curve - it plots the energy loss of ionizing radiation during its travel through matter', 'role': 'assistant'}]