This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': "Frey's syndrome is caused by \nSelect and explain. \nA. Post traumatic nerve fibers of facial nerve with parasympathetic of auriculotemporal nerve, B. Greater auricular nerve with auriculotemporal nerve, C. Facial nerve with greater auricular nerve, D. None", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Frey&;s syndrome results from parotid surgery due to aberrant regeneration of parasympathetic fibres of the facial nerve and auriculotemporal nerve. Ref: Dhingra 6th edition pg. 98', 'role': 'assistant'}]