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': 'Which of the following is not true for binocular single vision ? \nSelect and explain. \nA. Provides stereoscopic vision, B. Is present since bih, C. Is the cause of diplopia in paralytic squint, D. Fusion is its second grade', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Is present since bih', 'role': 'assistant'}]