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: Radiology
Invertogram to be done in a newborn – 
Select and explain. 
A. Immediately, B. After 2 hours, C. After 4 hours, D. After 6 hours
D: After 6 hours
Answer: D: After 6 hours 
Explanation: Invertogram is done to detect imperforate anus.
It is done after six hours of birth in infant as sufficient air may have collected in large intestine to cast a X-ray shadow.