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’s ridge is 
Select and explain. 
A. Has a role of upper fibres of palatopharyngeus muscle inserted internal to superior constrictor., B. prominence of mucous tissue is formed by the contraction of superior constrictor, C. Also known as Passavant's pad or palatopharyngeal ridge, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None