This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
[{'content': 'All are manometric features of achalasia except: \nSelect and explain. \nA. High LES pressure, B. Decreased LES relaxation, C. Segmental body peristalsis, D. Manometry helps in diagnosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Segmental body peristalsisRef: Sabiston 20th Edition, Pages 1015-1018Manometry findings in Achalasia:* LES will be hypertensive* LES fails to relax with deglutition* Body of esophagus has increased pressure* No evidence of progressive peristalsisLow amplitude wave forms', 'role': 'assistant'}]