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': 'Fundus flouoscien angiography is least useful in? \nSelect and explain. \nA. Diabetic retinopathy, B. Central serous retinopathy, C. Cystoids macular edema, D. None of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., None of the above Fluorescein angiography is useful in all conditions. Fluorescein angiography is used in :? Diabetic retinopathy Neoplasm Papilloedema Central serous retinopathy Retinitis pigmentosa and other retinal degeneration Choroidal diseases : Choroidal neovascularization Vascular occlusions (CRVO, CRAO) Eale's disease Cystoid macular edema", 'role': 'assistant'}]