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
Cataract blindness is: 
Select and explain. 
A. Preventable, B. Curable, C. Avoidable, D. Curable and avoidable
B: Curable
Answer: B: Curable 
Explanation: Ans. Curable