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': "The adenocarcinoma of esophagus-develops in ? \nSelect and explain. \nA. Barret's esophagus, B. Long standing achalasia, C. Corrosive stricture, D. Alcohol abuse", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Barrett's Esophagus Adenocarcinoma of esophagus almost always arises in Barrett's esophagus. Other option i.e. long standing achalasia, corrosive stricture and alcohol abuse are risk factors for squamous cell Ca of esophagus", 'role': 'assistant'}]