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: Surgery
[{'content': "True about Schatzki's ring: \nSelect and explain. \nA. Has skeletal muscle, B. Causes dysphagia, C. Contains all the layers of the esophagus, D. All", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans is b' i.e. Causes dysphagia", 'role': 'assistant'}]