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': 'Argyll Robeson pupil is commonly seen in: March 2013 \nSelect and explain. \nA. Retinitis pigmentosa, B. Diabetic retinopathy, C. Encephalitis, D. Neurosyphilis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Neurosyphilis', 'role': 'assistant'}]