This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Examination of the Eye, Subject name: Ophthalmology
[{'content': 'Painless sudden visual loss is seen in all except: \nSelect and explain. \nA. CRAO, B. Retinal detachment, C. Vitreous haemorrhage, D. Angle closure glaucoma', 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer ie 'd' ie Angle closure glaucoma (Ref. Parson, 19/e, p307, p148)Angle closure glaucoma is well known to be painful condition. Acute cases of angle closure glaucoma cause severe headache with red eye.Causes of painless sudden loss of visionUnilateralBilateral* Retinal detachment* Bilateral occipital infarction* Retinal vascular occlusion* Atypical optic neuritis* Vitreous Haemorrhage* Diabetic retinopathy* Retinal Haemorrhage* Grade IV hypertensive retinopathy with macular star* Exudative age related macular degeneration* Toxic optic neuropathy* Subluxation or dislocation of lens* Posterior neuritis", 'role': 'assistant'}]