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: Social & Preventive Medicine
[{'content': 'One gray of radiation is equal to – \nSelect and explain. \nA. 1 rad, B. 10 rad, C. 100 rad, D. 1000 rad', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]