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
Which of the following extrinsic muscle closes the oropharyngeal isthmus: 
Select and explain. 
A. Genioglossus, B. Hyoglossus, C. Palatoglossus, D. Styloglossus
C: Palatoglossus
Answer: C: Palatoglossus 
Explanation: None