This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': 'Diplopia is diagnostic feature of \nSelect and explain. \nA. Concomitant squint, B. Paralytic squint, C. Latent squint, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]