This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Robotics, Laparoscopy and Bariatric Surgery, Subject name: Surgery
[{'content': 'In addition to the effects of weight loss, the resolution of type 2 diabetes mellitus after the gastric sleeve procedure and RYGB is thought to be contributed to by ? \nSelect and explain. \nA. Reduced ghrelin production, B. Increased secretion of glucagon-like peptide-1 (GLP-1), C. Appetite suppression, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Gastrectomy removes much of the Ghrelin-producing poion of the stomach, leading to weight loss after both gastric sleeve and RYGB procedures. GLP-1, is dramatically increased after RYGB, and after gastric sleeve', 'role': 'assistant'}]