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
In which one of the following conditions is gas under diaphragm not seen- 
Select and explain. 
A. Perforated duodenal ulcer, B. Typhoid perforation, C. After laparotomy, D. Spontaneous rupture of oesophagus
D: Spontaneous rupture of oesophagus
Answer: D: Spontaneous rupture of oesophagus 
Explanation: Ans. is 'd' i.e., Spontaneous rupture of oesophagus