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': 'First Investigation of choice in blunt trauma abdomen when the patient first comes to the ER room- \nSelect and explain. \nA. CT, B. MRI, C. X-ray abdomen, D. FAST', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., FAST", 'role': 'assistant'}]