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 longest intracranial course? \nSelect and explain. \nA. Optic, B. Abducent, C. Trigemina, D. D i.e., Trochlear', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e., Trochlear', 'role': 'assistant'}]