This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Which of the following forms the Passavant&;s ridge? 
Select and explain. 
A. Palatoglossus, B. Salpingopharyngeus, C. Palatopharyngeus, D. Hyoglossus
C: Palatopharyngeus
Answer: C: Palatopharyngeus 
Explanation: Some of the upper fibres of the palatopharyngeus pass circularly deep to the mucous membrane of the pharynx,and form a sphincter internal to the superior constrictor.These fibres constitute passavant's muscle which on contraction raises a ridge called the Passavant's Ridge. REF.BDC VOL.3,FIFTH EDITION