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
All are ocular emergencies except - 
Select and explain. 
A. Angle closure glaucoma, B. Central serous retinopathy, C. Retinal detachment, D. Central retinal arterial occlusion
B: Central serous retinopathy
Answer: B: Central serous retinopathy 
Explanation: Central serous retinopathy (CSR) is typically a self limiting disease and undergoes spontaneous resolution in 80 to 90% of cases.

Ocular emergencies 

Closed - angle glaucoma                                                   
Retinal detachment                          
Foreign body     
Orbital fractures          
Corneal abrasions, lacerations, ulcers   
Ruptured globe        
CRAO   
Chemical burns
Retrobulbar hematoma