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': 'Down and out deviation of eyeball is due to Paralysis of which cranial nerve \nSelect and explain. \nA. 2, B. 3, C. 6, D. 9', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Down and out deviation is due to 3rd nerve palsy due to unopposed action of lateral rectus and superior oblique.', 'role': 'assistant'}]