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
[{'content': "Passavant’s ridge is \nSelect and explain. \nA. 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", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]