This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': "Borchardt's triad of acute epigastric pain, violent retching and inability to pass a nsogastric tube is seen in patients with \nSelect and explain. \nA. Acute gastric volvulus, B. Achalasia cardia, C. Jejunogastric intussusception, D. Hitus hernia", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A volvulus is a twisting or axial rotation of a portion of bowel\xa0about its mesentery.\nWhen complete it forms a closed loop of\xa0obstruction with resultant ischaemia secondary to vascular occlusion.', 'role': 'assistant'}]