This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding from the GUT and diseases of esophagus, Subject name: Medicine
[{'content': "Endoscopic mucosal resection in Barrett's esophagus results in: \nSelect and explain. \nA. Stricture esophagus, B. Peptic ulceration, C. Reflux esophagitis, D. Achalasia cardia", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Complications of endoscopic therapy in barrett esophagus should be divided into immediate and delayed outcomes. Immediate complications include bleeding and perforation. Delayed complications from ablative therapy include stricture formation.', 'role': 'assistant'}]