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': "Retinitis pigmentosa is a feature of all except – \nSelect and explain. \nA. Refsum's disease, B. Hallervorden–Spatz disease, C. NARP, D. Abetalipoproteinemia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]