This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
During ear examination, cough occurs due to stimulation of - 
Select and explain. 
A. Vagus, B. Trigeminal, C. Hypoglossal, D. Trochlear
A: Vagus
Answer: A: Vagus 
Explanation: Ans. is 'a' i.e., Vagus "Irritation of the auricular branch of the vagus in the external ear may reflexly cause cough, vomitting.or even death due to sudden cardiac inhibition. " - BDCo Auricular branch of the vagus nerve is also known as Alderman's nerve.