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 emergency except: 
Select and explain. 
A. Eye injury, B. Sympathetic ophthalmitis, C. Retinal aery occlusion, D. CRVO
D: CRVO
Answer: D: CRVO 
Explanation: Answer- (D) CRVOComon ophthalmic emergencies are :-Acute congestive glaucomaRuptured globeUlcerative or traumatic corneal diseasesOptic neuritisHyphemaEndophthalmitisAcute blindnessOrbital cellulitisEyelid or conjunctival lacerationCentral retinal aerial occlusion (CRAG)Anterior lens subluxationRetinal detachment