This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Squint, Subject name: Ophthalmology
[{'content': 'Modified Kastenbaum surgery is done for \nSelect and explain. \nA. Esotropia, B. Nystagmus, C. Superior oblique palsy, D. Third nerve palsy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Modified Kastenbaum Surgery *Recession resection of all four horizontal recti is done according to the type and amount of nystagmus', 'role': 'assistant'}]