This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Nerves, Subject name: Anatomy
[{'content': '75% contribution to parasympathetic system is by which cranial nerve - \nSelect and explain. \nA. Oculomotor, B. Facial, C. Glossopharyngeal, D. Vagus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is D i.e., Vagus "Vagus nerve contains almost 75% of all parasympathetic nerve fibers" - Clinical anatomy "About 75% of all parasympathetic nerve fibers are in vagus nerve" - Miller\'s Anesthesia', 'role': 'assistant'}]