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
A 44 year old female has history of blunt trauma to the abdomen the best investigation is - 
Select and explain. 
A. USG, B. CT Scan, C. Complete Hemogram, D. Abdominal X-ray
A: USG
Answer: A: USG 
Explanation: Answer- A. USGIf patient is hemodynamically stable and can be shifted - CT scan is the best.If patient is hemodynamically unstable (cannot be shifted) - USG is the investigation of choice.