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': 'All of the following are primarily restrictive operations for morbid obesity, except: \nSelect and explain. \nA. Veical band gastroplasty, B. Duodenal switch operation, C. Roux-en-Y gastric bypass, D. Laparoscopic adjustable gastric banding', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Types of Bariatric Surgeries: Bariatric operation Mechanism of action Veical banded gastroplasty Laparoscopic adjustable gastric banding (Safest & reversible) Restrictive Roux-en-Y gastric bypass (RYGB): MC performed procedure now-a-days Largely Biliopancreatic diversion- Duodenal switch Largely Malabsorptive/Mildly Restrictive', 'role': 'assistant'}]