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: Radiology
In a patient with abdominal trauma who is hemodynamically stable, what would be the investigation of choice? 
Select and explain. 
A. FAST, B. DPL, C. Barium meal, D. Erect x- ray abdomen
A: FAST
Answer: A: FAST 
Explanation: A i.e. FAST