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': 'Most common cause of coical blindness ? \nSelect and explain. \nA. Unilateral occipital lobe infarction, B. Bilateral temporal lobe infacion, C. Bilateral occipital lobe infarction, D. Unilateral temporal lobe infarction', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Bilateral occipital lobe infarction COICAL BLINDNESS Coical blindness (visual coex disease) is produced by bilateral occipital lobe lesions. Unilateral occipital lobe lesions typically produce contralateral macular sparing congruous homonymous hemianopia. Causes of coical blindness include: Vascular lesions producing bilateral occipital infarction are the commonest cause of coical blindness (e.g., embolisation of posterior cerebral aeries). Head injury involving bilateral occipital lobes is the second common cause. Tumours, primary (e.g., falcotentorial meningiomas, bilateral gliomas) or metastatic are rare causes. Other rare causes of coical blindness are migraine, hypoxic encephalopathy, Schilder's disease and other leukodystrophies.", 'role': 'assistant'}]