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
[{'content': 'First step in management of blunt trauma abdomen is \nSelect and explain. \nA. DPL, B. CECT, C. X-ray abdomen erect, D. FAST', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]