This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
Other than cataract, which one among the following is the highest prevalent cause of blindness in the world - 
Select and explain. 
A. Corneal opacity, B. Diabetic retinopathy, C. Glaucoma, D. Trachoma
C: Glaucoma
Answer: C: Glaucoma 
Explanation: Cataract 39% Glaucoma 10% tracoma3% diabeticretinopathy 4% Ref-Park&;s textbook of Preventive and social medicine 23rd edition. .