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
True about oesophageal perforation 
Select and explain. 
A. Barium swallow is diagnostic, B. Treatment is primary repair, C. MC after traumatic injury, D. Repair delayed beyond 24 hr
A: Barium swallow is diagnostic
Answer: A: Barium swallow is diagnostic 
Explanation: Diagnosis of an oesophagal perforation may be made radiographically. A chest roentgenogram may demonstrate a hydropneumothorax. Contrast esophagography is performed using barium for a suspected thoracic perforation and Gastrografin for an abdominal perforation. In few cases, barium swallow may cause peritonitis in oesophageal perforation Most oesophagal perforations occur after endoscopic instrumentation for a diagnostic or therapeutic procedure. Surgery is not indicated for every patient with a perforation of the oesophagus. The so-called golden period for primary closure of an oesophagal perforation is within the first 24 hours. Sabiston 20th edition pg: 1053