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': 'Day light factor in living rooms should be: \nSelect and explain. \nA. 6%, B. 8%, C. 10%, D. 12%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 8%', 'role': 'assistant'}]