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 not the surgery for GERD \nSelect and explain. \nA. Nissens fundoplication, B. Linx, C. Poem, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Per Oral endoscopic myotomy is done for achalasia cardia', 'role': 'assistant'}]