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
[{'content': 'Blunt injury abdomen, patient was hemodynamically stable, next investigation: \nSelect and explain. \nA. X-ray abdomen, B. Barium swallow, C. FAST, D. DPL', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]