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
All the following are true regarding FASTexcept 
Select and explain. 
A. It is a focused abdominal sonar for trauma, B. It is accurate in detecting <50 ml. of free blood, C. It cannot reliably exclude injury in penetrating trauma, D. It detects free fluid in the abdomen or pericardium
B: It is accurate in detecting <50 ml. of free blood
Answer: B: It is accurate in detecting <50 ml. of free blood 
Explanation: None