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
Passavant ridge is formed by: 
Select and explain. 
A. Tensor veli palati and superior constrictor, B. Palatopharyngeus and superior constrictor, C. Palatopharyngeus and inferior constrictor, D. Palatoglossus and superior constrictor
B: Palatopharyngeus and superior constrictor
Answer: B: Palatopharyngeus and superior constrictor 
Explanation: Some fibres of the palatopharyngeus muscle (arising from palatine aponeurosis) sweep horizontally backwards and join the upper fibres of the superior constrictor muscle to form a U-shaped muscle-loop in the posterior pharyngeal wall underneath the mucosa, which is pulled forward during swallowing to form the Passavant ridge.