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 40-year-old male with h/o progressive dysphagia for liquid has dilated esophagus on barium meal. Most likely cause is \nSelect and explain. \nA. Achalasia cardia, B. Cancer at cardia, C. Ca esophagus, D. Carcinoma gastric fundus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Achalasia cardia * All of the above mentioned condition except Achalasia cardia occur around 60 years of age. Features for differentiation between achalasia cardia and carcinoma esophagus: Achalasiacardia Carcinomaesophagus a. Around30-40 yearsofage a. Presentationafter60yearsofage b. No dysphagiafor solids b. Dysphagiafor solidspresent c. Dysphagiaforliquidspresent c. Dysphagiaforliquidsonlyat verylatestages', 'role': 'assistant'}]