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
Investigation of choice for blunt trauma abdomen in unstable patient - 
Select and explain. 
A. X-ray abdomen, B. USG, C. Diagnostic Peritoneal lavage (DPL), D. MRI
B: USG
Answer: B: USG 
Explanation: None