This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck Triangles and parotid gland, Subject name: Anatomy
Frey's syndrome (gustatory sweating) is due to lesion of 
Select and explain. 
A. Glossopharyngeal nerve, B. Chorda tympani nerve, C. Trigeminal nerve, D. Auriculo-temporal nerve
D: Auriculo-temporal nerve
Answer: D: Auriculo-temporal nerve 
Explanation: Auriculotemporal nerve carries parasympathetic secreto-motor fibres to parotid gland. After parotidectomy, sometimes there may be regeneration of secretomotor fibres in Auriculotemporal N This regeneration is misdirected into sweat glands. Thus, whenever the patient thinks of food/smells /chews food there would be stimulation of sweat glands & hyperaemia resulting in redness & sweating in front of ear on cheek. This clinical entity is called 'FREY SYNDROME'/AURICULOTEMPORAL SYNDROME/GUSTATORY SWEATING. Image showing Starch-iodine test: