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
Typhoid perforation is diagnosed by- 
Select and explain. 
A. Plain X-ray of abdomen in erect posture, B. Rectal examination, C. Gastric aspiration, D. Barium enema
A: Plain X-ray of abdomen in erect posture
Answer: A: Plain X-ray of abdomen in erect posture 
Explanation: None