This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Ophthalmology
[{'content': 'All are ophthalmological emergencies except - \nSelect and explain. \nA. CRAO, B. CRVO, C. Acute congestive glaucoma, D. Endophthalmitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: in the late stages only macula shows marked pigmentary changes and neovascularisation. REF:khurana,pg no 271', 'role': 'assistant'}]