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
True about Schatzki's ring: 
Select and explain. 
A. Has skeletal muscle, B. Causes dysphagia, C. Contains all the layers of the esophagus, D. All
B: Causes dysphagia
Answer: B: Causes dysphagia 
Explanation: Ans is b' i.e. Causes dysphagia