This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy Pa 2, Subject name: Radiology
[{'content': 'Most ionizing radiation among the following is? \nSelect and explain. \nA. X rays, B. Gamma rays, C. Alpha rays, D. Beta rays', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Alpha rays have the highest ionization power, whereas gamma rays have the highest penetration power.', 'role': 'assistant'}]