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: ENT
[{'content': 'The cough response caused while cleaning the ear canal is mediated by stimulation of- \nSelect and explain. \nA. The V cranial nerve, B. Innervation of external ear canal by C1 and C2, C. The X cranial nerve, D. Branches of the VII cranial nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: “Irritation of the auricular branches of the vagus in the external ear (by ear wax, syringe, etc.) may reflexly cause cough, vomiting, or even\ndeath due to sudden cardiac inhibition.”\nAuricular branch of the vagus nerve is also known as Arnold’s nerve or Alderman’s nerve.\nAlso Know\nSimilarly irritation of recurrent laryngeal nerve by enlarged lymph nodes in children may also produce a persistent cough.', 'role': 'assistant'}]