This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
First step in management of blunt trauma abdomen is 
Select and explain. 
A. DPL, B. CECT, C. X-ray abdomen erect, D. FAST
D: FAST
Answer: D: FAST 
Explanation: FAST (Focussed Abdominal Sonar Trauma): Rapid, non-invasive, poable bedside method of investigation focusing on pericardium, splenic, hepatic, and pelvic vessels. Blood more than 100ml in cavities can be identified. Not reliable for bowel or penetrating injuries. Ref : SRB&;s 4thE pg:149