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
Initial IOC for intussesception is: March 2003 
Select and explain. 
A. X-ray, B. USG, C. Barium enema, D. CT scan
B: USG
Answer: B: USG 
Explanation: Ans. B i.e. USG