This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and Health, Subject name: Social & Preventive Medicine
[{'content': 'Radiation exposure permissible per year is? \nSelect and explain. \nA. 2 rads, B. 5 rads, C. 10 rads, D. 20 rads', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) 5 radsRef: Park 20th ed p 651', 'role': 'assistant'}]