This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': "A female patient has dysphagia, intermittent epigastric pain. On endoscopy, oesophagus was dilated above and narrow at the bottom. Treatment is(not related-surgery) \nSelect and explain. \nA. PPI, B. Dilatation, C. Esophagectomy, D. Heller's cardiomyotomy", 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]