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 muscles is responsible for the formation of the posterior tonsillar pillar? 
Select and explain. 
A. Stylopharyngeus., B. Tensor veli palatine., C. Palatoglossus., D. Palatopharyngeus.
D: Palatopharyngeus.
Answer: D: Palatopharyngeus. 
Explanation: The palatopharyngeus forms the posterior tonsillar pillar. It also functions to close off the nasopharynx and larynx during swallowing. The anterior tonsillar pillar is formed by the palatoglossus.