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 sliding esophageal hernia in all cases ? \nSelect and explain. \nA. Esophagus always sho, B. Cardia goes through hiatus, C. Cardia and fundus goes through hiatus, D. Peritoneal sac goes with paraesophageal hernia', 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is 'b' i.e. Cardia goes through hiatus", 'role': 'assistant'}]