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': '1 Sv is \nSelect and explain. \nA. 100 rads, B. 100 rem, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 1 Gy = 100 rads\n1 Sv = 100 rem', 'role': 'assistant'}]