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': 'All are manometric features of achalasia except (not related -medicine) \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: Elevated intraesophageal pressure (pressurization of the esophagus) from incomplete air evacuation Simultaneous mirrored contractions with no evidence of progressive peristalsisLow-amplitude waveforms indicating a lack of muscular tone', 'role': 'assistant'}]