This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Tubular vision is seen in \nSelect and explain. \nA. Retinitis pigmentosa, B. Bread crumb cataract, C. Balint syndrome, D. central serous retinopathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Retinitis pigmentosa', 'role': 'assistant'}]