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
75% contribution to parasympathetic system is by which cranial nerve - 
Select and explain. 
A. Oculomotor, B. Facial, C. Glossopharyngeal, D. Vagus
D: Vagus
Answer: D: Vagus 
Explanation: 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