This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Superior cervical ganglion 
Select and explain. 
A. Is the smallest cervical ganglion, B. Gives rise to plexus around internal carotid artery, a part of which supplies sphincter pupillae, C. Deep petrosal nerve of pterygopalatine ganglion is derived from plexus around internal carotid artery, D. Left superior cervical cardiac branch goes to deep cardiac plexus
C: Deep petrosal nerve of pterygopalatine ganglion is derived from plexus around internal carotid artery
Answer: C: Deep petrosal nerve of pterygopalatine ganglion is derived from plexus around internal carotid artery 
Explanation: Superior cervical ganglion is largest cervical ganglion. The plexus formed around internal carotid artery supplies dilator pupille. Superior cervical cardiac branch on left goes to superficial cardiac plexus,while that on right goes to deep cardiac plexus.