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 of the following subtypes of cataract is the most common cause of visual morbidity: 
Select and explain. 
A. Senile, B. Congenital, C. Traumatic, D. Drug toxicity
A: Senile
Answer: A: Senile 
Explanation: Ans. A: Senile Age-related/senile cataract is responsible for 48% of world blindness, according to the World Health Organization (WHO).