This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Air, Light, Sound, Housing, Radiation, Waste Disposal, Subject name: Social & Preventive Medicine
How much Foot candles light is required for minimum illumination to get a satisfactory vision? 
Select and explain. 
A. 15-20, B. 15-Oct, C. 20-25, D. 25-30
A: 15-20
Answer: A: 15-20 
Explanation: 15-20 foot candle light is required for min illumination to get a satisfactory vision. 1 Foot candle = 10.76 Lux DLF (day light factor) in a living room should be >= 8% & min >= 10% in kitchen. DLF is a comparison of light in room compared from natural light outside.