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
Nerve to pterygoid canal is formed from: 
Select and explain. 
A. Deep petrosal nerve joined by greater petrosal nerve, B. Facial nerve, C. Lesser superficial petrosal nerve, D. Lesser petrosal nerve
A: Deep petrosal nerve joined by greater petrosal nerve
Answer: A: Deep petrosal nerve joined by greater petrosal nerve 
Explanation: 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.