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': 'Maximum dose of radiation per year in a human which is safe \nSelect and explain. \nA. 1 rads, B. 5 rads, C. 10 rads, D. 20 rads', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 5 rads Amount of radiation received from out space = 0.1 rad/yearQ Additional permissible dose =', 'role': 'assistant'}]