This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Surgery
A patient with blunt trauma of abdomen at 48 hours, USG shows normal, but patient had tenderness in left lumbar region. Best appropriate diagnosis is by: 
Select and explain. 
A. MCU, B. IVP, C. CECT abdomen, D. Repeat USG
C: CECT abdomen
Answer: C: CECT abdomen 
Explanation: Suspect - injury of kidney in left abdomen. MCU is IOC for Vesicourethral Reflux IVP is IOC for Ureterocele