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': 'Trauma cases of which area use FAST technique to detect blood? \nSelect and explain. \nA. Pericardial, B. Splenic, C. Hepatic, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: FAST is a technique whereby ultrasound imaging is used to assess the torso for the presence of blood, either in the abdominal cavity or in the pericardium. The purpose of the ultrasound evaluation of the injured casualty is to determine the presence of free intra-abdominal or pericardial fluid.', 'role': 'assistant'}]