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 cranial nerve with the largest intra-cranial course is: \nSelect and explain. \nA. Abducens- nerve, B. Trochlear nerve, C. Optic nerve, D. Trigeminal nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Trochlear nerve', 'role': 'assistant'}]