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: Radiology
Ultrasonogram is not useful in: 
Select and explain. 
A. CBD stones at the distal end of the CBD, B. Breast cyst, C. Ascites, D. Full bladder
A: CBD stones at the distal end of the CBD
Answer: A: CBD stones at the distal end of the CBD 
Explanation: Ans. CBD stones at the distal end of the CBD