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 patients complains of occasional vomiting of food paicles eaten a few days ago. His wife repos that his breath smells foul. The most likely diagnosis is ? \nSelect and explain. \nA. Pyloric obstruction, B. Carcinoma stomach, C. Carcinoma esophagus, D. Achalasia cardia', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Achalasia cardia", 'role': 'assistant'}]