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: Unknown
[{'content': 'About Bragg peak effect of protons all are true except: \nSelect and explain. \nA. Electromagnetic radiation, B. Produce ionization in biological system, C. The dose of a single beam is two to four times greater than the path dose, D. Beam therapy for AV malformation of the brain', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref. Grainger and Allison's Diagnostic Radiology. Page. 30\n\xa0\nBragg Peak\n\nThe\xa0Bragg peak\xa0is a pronounced peak on the\xa0Bragg curve\xa0which plots the energy loss of\xa0ionizing radiation\xa0during its travel through matter.\nFor\xa0protons,\xa0α-rays, and other\xa0ion rays, the peak occurs immediately before the particles come to rest", 'role': 'assistant'}]