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
Deep petrosal nerve is formed from 
Select and explain. 
A. Symathetic plexus around carotid, B. Facial nerve, C. Glossopharyngeal, D. Internal carotid plexus
A: Symathetic plexus around carotid
Answer: A: Symathetic plexus around carotid 
Explanation: 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