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: Unknown
[{'content': 'Investigation to be done immediately when an unstable patient comes with blunt abdominal trauma is - \nSelect and explain. \nA. USG, B. CT Scan, C. Complete Hemogram, D. Abdominal Xray', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., USG Stable patient - CT Unstable patient - FAST", 'role': 'assistant'}]