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': 'A patient presents with vomiting and severe colicky abdominal pain. He underwent bariatric surgery 5 years ago. He is advised to undergo an emergency reoperation. Which of the following procedures did he most likely undergo 5 years ago? \nSelect and explain. \nA. Laparoscopic Roux-en-Y gastric bypass, B. Laparoscopic adjustable gastric banding, C. Sleeve gastrectomy, D. Biliopancreatic division', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Patient must have underwent Laparoscopic Roux-en-Y gastric bypass 5 years ago Now presented with internal hernia- late complication of gastric bypass surgery Closure of hernia defects at the time of gastric bypass surgery reduces the incidence of symptomatic internal hernias in future.', 'role': 'assistant'}]