This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Which of the following is false about lower esophageal sphincter \nSelect and explain. \nA. Relaxation is mediated by VIP and nitrous oxide, B. Resting pressure is 10 to 25 mmHg, C. Pinch cock action of diaphragm protects against reflex, D. Abnormal relaxation will cause achalasia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Relaxation will cause GERD\nFailure to relax will cause achalasia', 'role': 'assistant'}]