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': 'Anterior vitreous cells are least likely to be found in \nSelect and explain. \nA. CMV, B. Serpiginous Choroidopathy, C. Chronic cyclitis, D. Retinitis pigmentosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Anterior vitreous cells are least likely to be found in Retinitis pigmentosa.', 'role': 'assistant'}]