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 true about achalasia except (not related -pathology) \nSelect and explain. \nA. Dilatation of proximal segment, B. It predisposes to malignancy, C. Body peristalsis is normal, D. LES pressure is increased', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Destruction of the nerves to LES is primary pathology and degeneration of neuromuscular function of the body of esophagus is secondary. Absence of body peristalsis and poor LES relaxation is mandatory for diagnosis.', 'role': 'assistant'}]