<prompt> The cough response caused while cleaning the ear canal is mediated by stimulation of-The V cranial nerveInnervation of external ear canal by C1 and C2The X cranial nerveBranches of the VII cranial nerve  <response>: Irritation of the auricular branches of the vagus in the external ear by ear wax, syringe, etc. may reflexly cause cough, vomiting, or evendeath due to sudden cardiac inhibition.Auricular branch of the vagus nerve is also known as Arnolds nerve or Aldermans nerve.Also KnowSimilarly irritation of recurrent laryngeal nerve by enlarged lymph nodes in children may also produce a persistent cough. 