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': 'Which of the following extrinsic muscle closes the oropharyngeal isthmus: \nSelect and explain. \nA. Genioglossus, B. Hyoglossus, C. Palatoglossus, D. Styloglossus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]