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
Which of the following sign is not seen in hypertrophic pyloric stenosis 
Select and explain. 
A. String sign, B. Shoulder sign, C. Double track sign, D. Troseier sign
D: Troseier sign
Answer: D: Troseier sign 
Explanation: None