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': 'Recommended illumination suggested by Illuminating Engineer Society for general office work: \nSelect and explain. \nA. 100 lux, B. 400 lux, C. 900 lux, D. 2500 lux', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Visual task Illumination (lux) Casual reading 100 General office work 400 Fine assembly 900 Watch making 2500 Ref: Park 21st edition, page 684. Chapter: Environment and health.', 'role': 'assistant'}]