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 one of the following is not a ocular emergencies? 
Select and explain. 
A. Angle closure glaucoma, B. Central retinal aerial occlusion, C. Central serous retinopathy, D. Retinal detachment
C: Central serous retinopathy
Answer: C: Central serous retinopathy 
Explanation: Central serous retinopathy is a self limiting condition that undergoes spontaneous resolution in 80-90% of the cases. Visual acuity recovers normal or near normal with in 4-12 weeks. It's not an ocular emergency. Ref: A.K KHURANA (2005), Chapter 11, "Disease of The Retina", In the book, "Opthalmology", 3rd Edition, Newdelhi, Page 263