This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Smoke stake pattern is characteristic of? \nSelect and explain. \nA. Sickle cell retinopathy, B. Sarcoidosis, C. Acute retinal necrosis, D. Central serous retinopathy', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Central serous retinopathy * Smoke stack pattern (small hyper fluorescent spot which ascends vertically like a smoke-stack), which gradually spreads laterally to take a mushroom or umbrella configuration, is a Fundus Fluorescein Angiography (FFA) finding of Central Serous Retinopathy.* Another important FFA finding of CSR is Ink-blot or enlarging dot pattern (small hyperfluorescent spot which gradually increases in size.* Among these the most common FFA finding is ink-blot pattern.", 'role': 'assistant'}]