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': 'Most common cranial nerve involved in ophthalmoplegic migraine is: \nSelect and explain. \nA. II nerve, B. III nerve, C. V nerve, D. VI nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. III nerve', 'role': 'assistant'}]