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': 'Trigeminal nerve has how many nuclei in CNS \nSelect and explain. \nA. 3, B. 4, C. 5, D. 6', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]