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': "All of the following are causes of night blindness EXCEPT: \nSelect and explain. \nA. Oguchi's disease, B. Vitamin A deficiency, C. High myopia, D. Devics disease", 'role': 'user'}, {'content': "Answer: D \nExplanation: Causes of night blindness or nyctalopia: Vitamin A deficiency Tapetoretinal degenerations like retinitis pigmentosa Congenital high myopia Familial congenital night blindness Oguchi's disease Lenticular or corneal opacities Advanced primary open angle glaucoma", 'role': 'assistant'}]