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': "Acute loss of vision in case of alcoholic pancreatitis: \nSelect and explain. \nA. Purtscher's retinopathy, B. Acute congestive glaucoma, C. Central retinal artery obstruction, D. Optic neuritis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Purtscher's retinopathyRef: Yanoff & Duker 4/e, p. 679It is a blockage of the retinal capillaries by emboli leading to multiple haemorrhages and cotton wool spots throughout the retina.", 'role': 'assistant'}]