This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Deep petrosal nerve is formed from \nSelect and explain. \nA. Symathetic plexus around carotid, B. Facial nerve, C. Glossopharyngeal, D. Internal carotid plexus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The deep petrosal nerve,sympathetic in nature is a branch of the sympathetic plexus around the internal carotid aery.It contains postganglionic fibres from the superior cervical sympathetic ganglion. Ref,BDC VOL.3,Fouh edition', 'role': 'assistant'}]