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': 'Night blindness may be caused by all except \nSelect and explain. \nA. Vitamin A deficiency, B. Retinitis pigmentosa, C. Syphilis, D. Lattice degeneration', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Lattice degeneration', 'role': 'assistant'}]