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 seen in? 
Select and explain. 
A. Oropharynx, B. Nasopharynx, C. Laryngopharynx, D. Lateral nasal wall
B: Nasopharynx
Answer: B: Nasopharynx 
Explanation: Nasopharyngeal Isthmus: Fibres of palatopharyngeus muscle (arising from palatine aponeurosis) +upper fibres of superior constrictor muscle form incomplete raised ring at posterior & lateral pharyngeal wall known as = Passavant ridge.