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
All of the following are primarily restrictive operations for morbid obesity, except: 
Select and explain. 
A. Veical band gastroplasty, B. Duodenal switch operation, C. Roux-en-Y gastric bypass, D. Laparoscopic adjustable gastric banding
B: Duodenal switch operation
Answer: B: Duodenal switch operation 
Explanation: 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