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
All are true about intussusception except 
Select and explain. 
A. Barium must be used in children after 48 hours, B. X-ray shows paucity of colonic gas, C. USG shows pseudoxidney sign, D. X-ray shows lump shadow
A: Barium must be used in children after 48 hours
Answer: A: Barium must be used in children after 48 hours 
Explanation: None