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': 'What is the basic minimum illumination required for satisfactory vision ? \nSelect and explain. \nA. 10-15 foot candles, B. 15-20 foot candles, C. 20-25 foot candles, D. 25-30 foot candles', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 15 to 20 foot Candles Light Good light is essential for efficient vision If the lighting conditions are not ideal. the visual apparatus is put to strain which may lead to general fatigue and loss of efficiency. o An illumination of 15 to 20 foot candles is accepted as a basic minimum fin' satislUctoty", 'role': 'assistant'}]