This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Facial Nerve and its disorders, Subject name: ENT
Frey's syndrome is caused by: 
Select and explain. 
A. Aberrant reinnervation of parasympathetic fibres of auriculotemporal nerve with sympathetic sweat glands, B. Aberrant reinnervation of parasympathetic fibres of auriculotemporal nerve with Greater superficial petrosal nerve, C. Abnormal cross innervation of Facial nerve with greater auricular nerve, D. Abnormal cross innervation of Facial nerve with auriculotemporal nerve
A: Aberrant reinnervation of parasympathetic fibres of auriculotemporal nerve with sympathetic sweat glands
Answer: A: Aberrant reinnervation of parasympathetic fibres of auriculotemporal nerve with sympathetic sweat glands 
Explanation: Frey's syndrome is gustatory sweating i.e. when the patient eats, he has sweating over the cheek skin over the parotid. In section of auriculotemporal nerve during parotid surgery, the nerve aberrantly reconnects with the sympathetic sweat glands of the skin overlying the parotid.