This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
Which of the following are the bariatric surgical procedures? 
Select and explain. 
A. Vertical banded gastroplasty, B. Roux-en Y gastric bypass, C. Biliopancreatic diversion, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ans. is 'd' i.e., All the above Bariatric surgical procedures includea) Vertical banded gastroplastyb) Adjustable gastric bandingc) Roux-en Y gastric bypassd) Biliopancreatic diversione) Duodenal switch