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 mot penetrating power ? \nSelect and explain. \nA. α – particle, B. β – particle, C. γ – radiation, D. Electron beam', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Penetration Power\nMaximum : Gamma - rays (1000 times of arays)\nMinimum : Alpha rays', 'role': 'assistant'}]