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': 'Which of the following has highest ionizing potential – \nSelect and explain. \nA. X–ray, B. Gamma ray, C. α–rays, D. β–rays', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Penetration power : Gamma rays> X rays > Beta particle >Alpha particle (or helium ion) Ionizing & damaging power: is reserve Alpha particle (or helium ion) > Beta particle > X ray> Gamma ray', 'role': 'assistant'}]