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: Ophthalmology
Snow blindness is caused due to 
Select and explain. 
A. Extreme cold, B. UV  Rays, C. IR Rays, D. Vit A deficiency
B: UV  Rays
Answer: B: UV  Rays 
Explanation: Snow blindness is a painful, temporary loss of vision due to overexposure to the sun's UV rays.