This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
Freys syndrome develops secondary to abberant innervation of the skin over parotid by which cranial nerve - 
Select and explain. 
A. IX, B. X, C. XI, D. XII
A: IX
Answer: A: IX 
Explanation: Ans. is 'a' i.e., IX Freys Syndrome* Frey's syndrome (also known as Baillarger's syndrome, Dupuy's syndrome, auriculotemporal syndrome, or Frey-Baillarger syndrome) is a rare neurological disorder resulting from damage to or near the parotid glands responsible for making saliva, and from damage to the auriculotemporal nerve often from surgery.* The postganglionic CN IX fibers are responsible for stimulation of parotid secretion* The interruption of these nerve fibers may lead to gland atrophy.* In some cases of parotidectomy these CN IX fibers are aberrantly reinnervated to the skin, causing gustatory sweating or Frey's syndrome.