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
[{'content': 'Muscle supplied by glossopharyngeal nerve: \nSelect and explain. \nA. Platysma, B. Stylopharyngeus, C. Styloglossus, D. Genioglossus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Stylopharyngeus is the only muscle in the pharynx innervated by the glossopharyngeal nerve (CN IX) and is done by its motor branch, which supplies special visceral efferent (SVE) fibers to it.', 'role': 'assistant'}]