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
The commonest cause of cataract – 
Select and explain. 
A. Hereditary, B. DM, C. Trauma, D. Age related
D: Age related
Answer: D: Age related 
Explanation: Most common type of cataract is senile (age-related) cataract.