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
Trauma cases of which area use FAST technique to detect blood? 
Select and explain. 
A. Pericardial, B. Splenic, C. Hepatic, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: 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.