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
The defect in achalasia cardia is present in (not related -pathology) 
Select and explain. 
A. Myenteric plexus of Auerbach, B. Meissner's plexus, C. Kiesselbach's plexus, D. Mesenteric plexus
A: Myenteric plexus of Auerbach
Answer: A: Myenteric plexus of Auerbach 
Explanation: 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