This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals In Radiology, Subject name: Radiology
About Bragg peak effect of protons all are true, except: 
Select and explain. 
A. Electromagnetic radiation, B. Produce ionization in biological system, C. The dose of single beam is 2-4 times greater than the path dose, D. Beam therapy for AV malformation of the brain.
A: Electromagnetic radiation
Answer: A: Electromagnetic radiation 
Explanation: Ans. a. Electromagnetic radiationThe brag peak is a pronounced peak on the Bragg curve which plots the energy loss of ionizing radiation during its travel through matter.For proton, a-rays, and other ion rays, the peak occurs immediately before the particle come to rest.