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: Anatomy
[{'content': 'The superior oblique muscle is supplied by? \nSelect and explain. \nA. 3rd cranial nerve, B. 4th cranial nerve, C. 5th cranial nerve, D. 6th cranial nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The superior oblique muscle is supplied by4th cranial nerve.', 'role': 'assistant'}]