This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Cavity, Subject name: Anatomy
[{'content': 'Deep petrosal nerve is formed from - \nSelect and explain. \nA. Svmathetic plexus around carotid, B. Facial nerve, C. Glossopharyngeal, D. Internal carotid plexus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a'i.e., Symathetic plexus around carotid o Deep petorsai nerve (sympathetic) is a branch of the sympathetic plexus around the internal carotid artery'. It contains the postganglionic fibres from the superior cervical sympathetic ganglion.lt joins the greater petrosal nerve to form the nerve of the pterygoid canal.", 'role': 'assistant'}]