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
[{'content': 'Which of the following forms the Passavant&;s ridge? \nSelect and explain. \nA. Palatoglossus, B. Salpingopharyngeus, C. Palatopharyngeus, D. Hyoglossus', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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", 'role': 'assistant'}]