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': 'A 55-year old male had retero-sternal discomfo unrelated to physical exeion. Pain gets worse after lying down there is paial relief with antacids. The most likely diagnosis is- \nSelect and explain. \nA. Ischaemic hea disease, B. Carcinoma oesophagus, C. Achalasia cardia, D. Hiatus hernia', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Hiatus hernia", 'role': 'assistant'}]