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': 'Following are radiological evidence of Achalasia cardia except not related -radiology \nSelect and explain. \nA. Smooth narrowing of esophagus, B. Dilated touous esophagus, C. Absence of air in the fundus, D. Exaggerated peristalsis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]