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
Following are the causes of sudden loss of vision except ? 
Select and explain. 
A. Angle closure glaucoma, B. Endophthalmitis, C. Central serous retinopathy, D. Corneal ulceration
D: Corneal ulceration
Answer: D: Corneal ulceration 
Explanation: Ans. is 'd' i.e., Corneal ulceration