This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitreous and retina, Subject name: Ophthalmology
[{'content': "Umbrella configration on fluorescein angiogrphy is seen in - \nSelect and explain. \nA. Retinitis pigmentosa, B. Rhegmatous retinal detachment, C. Central serous retinopathy, D. Eale's disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Central serous retinopathy is a retinal disorder characterised by serous retinal detachment in the macula affecting mostly young men ages 20-45 yrs. Fluorescein angiography shows two patterns- Ink blot pattern Smoke stack pattern - small hyperfluorescent spot which ascends veically like a smoke stack and gradually spreads laterally to take a mushroom or umbrella configuration. Ref : Khurana page no. 293 edition 6th', 'role': 'assistant'}]