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
[{'content': 'Painless sudden visual loss is seen in all except \nSelect and explain. \nA. CRAO, B. Retinal detachment, C. Vitreous hemorrhage, D. Angle closure glaucoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Angle closure glaucoma Angle closure glaucoma is a cause of painful, not painless loss of visionS2', 'role': 'assistant'}]