This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'In which one of the following conditions is gas under diaphragm not seen \nSelect and explain. \nA. Perforated duodenal ulcer, B. Typhoid perforation, C. After laparotomy, D. Spontaneous rupture of oesophagus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: After spontaneous rupture, the pressure in the oesophagus rapidly increases and burst at its weakest point in lower one-third, sending a stream of material into the mediastinum and often into the pleural cavity. Thus pneumomediastinum is formed Reference: Bailey and Love edition: 24 page no: 996', 'role': 'assistant'}]