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
For satisfactory vision the minimum illumination accepted is – 
Select and explain. 
A. 15 to 20 foot candles, B. 30 to 40 candles, C. 40 to 50 candles, D. 70 to 90 candles
A: 15 to 20 foot candles
Answer: A: 15 to 20 foot candles 
Explanation: None