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: ENT
[{'content': 'Heller myotomy is used in: \nSelect and explain. \nA. Esophageal atresia, B. Achalasia, C. GERD, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A laparoscopic Heller myotomy and paial fundoplication is the procedure of choice for esophageal achalasia. The operation consists of a controlled division of the muscle fibers (ie, a myotomy) of the lower esophagus (5 cm) and proximal stomach (2 cm), followed by a paial fundoplication to prevent reflux.', 'role': 'assistant'}]