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': "The defect in achalasia cardia is present in (not related -pathology) \nSelect and explain. \nA. Myenteric plexus of Auerbach, B. Meissner's plexus, C. Kiesselbach's plexus, D. Mesenteric plexus", 'role': 'user'}, {'content': "Answer: A \nExplanation: Progressive inflammation and selective loss of the inhibitory myenteric neurons in Auerbach's plexus of the esophagus that normally secrete VIP and nitric oxide- Achalasia", 'role': 'assistant'}]