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
Which is the commonest cause of occular morbidity in the community 
Select and explain. 
A. Cataract, B. Refractive error, C. Occular injury, D. Vitamin A deficiency
B: Refractive error
Answer: B: Refractive error 
Explanation: B i.e. Refractory Error