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 longest cranial nerve : \nSelect and explain. \nA. Optic, B. Abducent, C. Trigeminal, D. vagus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e., vagusVagus (Xth) Cranial nerve has the longest and varied area of supply.The trigeminal (V, fifth) is the largest & thickest cranial nerve.The trochlear nerve is the smallest nerve in terms of the number of axons it contains. The trochlear nerve has the greatest intracranial length.The olfactory nerve is the shoest of the twelve cranial nerves Abducent nerve has the longest intra-cranial INTRADURAL course', 'role': 'assistant'}]