This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ULTRASOUND, Subject name: Radiology
All are hyperechoic on USG except 
Select and explain. 
A. Air, B. Bone, C. Calcification, D. Bile
D: Bile
Answer: D: Bile 
Explanation: Bile is hypoechoic on USG. Air, bone, calcification and fat are hyperechoic on USG. Bile duct shown in the figure.