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
[{'content': 'Investigation of choice for evaluation of upper abdominal trauma in a patient with stable vitals? \nSelect and explain. \nA. USG, B. CT, C. SCINTIGRAPHY, D. MRI', 'role': 'user'}, {'content': 'Answer: B \nExplanation: * 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:', 'role': 'assistant'}]