This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Nerves, Subject name: Anatomy
[{'content': 'Nerve to pterygoid canal is formed from: \nSelect and explain. \nA. Deep petrosal nerve joined by greater petrosal nerve, B. Facial nerve, C. Lesser superficial petrosal nerve, D. Lesser petrosal nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vidian nerve of pterygoid canal is formed by the union of greater petrosal nerve (parasympathetic fibers) and deep petrosal nerve (sympathetic fibers). The nerve is formed at the floor of foramen lacerum and runs anteriorly in pterygoid canal to reach the pterygopalatine ganglion.', 'role': 'assistant'}]