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: ENT
[{'content': 'Passavant ridge ? \nSelect and explain. \nA. Superior constrictor and palatopharyngeus, B. Inferior constrictor and palatopharyngeus, C. Superior constrictor and palatoglossus, D. Inferior constrictor and palatoglossus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Passavant ridge Near the superior margin of pharynx, a few fibres of superior constrictor blend with a band of muscle fibres belonging to the palatopharyngeus muscle. These fused fibres form a band or ring around the posterior wall and sidewalls of the nasopharyngeal isthumus. When the soft palate is elevated this muscle band appears as a ridge is known as passavant's ridge.", 'role': 'assistant'}]