This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
In CHPS which of the following is seen 
Select and explain. 
A. Non-bilious vomiting, B. Metabolic alkalosis, C. Aciduria, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: In CHPS, non-bilious vomiting, metabolic alkalosis and aciduria is seen. The morphological features are due to hyperophy and hyperplasia of the circular muscle with some contribution by the longitudinal muscle. The hyperophied muscle lengthens and narrows the pyloric channel. Radiographically, there is the lengthening of the pyloric channel with smooth symmetrical narrowing. The hyperophied muscle bulges retrogradely into the antrum, creating a 'shoulder'. In infants, HPS ultrasound is the technique of choice in the diagnosis of HPS.