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: Medicine
[{'content': 'Cause of sudden loss of vision in alcoholic pancreatitis is - \nSelect and explain. \nA. Central retinal artery obstruction, B. Acute congestive glaucoma, C. Purstchner retinopathy, D. Sudden alcohol withdrawl', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]