This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CT SCAN, Subject name: Radiology
Investigation of choice for evaluation of upper abdominal trauma in a patient with stable vitals? 
Select and explain. 
A. USG, B. CT, C. SCINTIGRAPHY, D. MRI
B: CT
Answer: B: CT 
Explanation: * Initial Investigation in a patient with abdominal trauma is USG to detect hemoperitoneum * Investigation of choice to know the source of hemoperitoneum in a stable patient is CECT-Abdomen. Radiological evaluation of abdominal trauma in emergency: