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 arises from \nSelect and explain. \nA. Facial nerve, B. Glossopharyngeal nerve, C. Plexus around internal carotid aery, D. Mandibullar nerve', 'role': 'user'}, {'content': "Answer: C \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. The nerve joins the greater petrosal nerve to form the nerve of the pterygoid canal. The sympathetic fibres in it are distributed through the branches of the pterygopalatine ganglion. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3, 4th edition.", 'role': 'assistant'}]