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: Pediatrics
Hypertrophic pyloric stanosis causes 
Select and explain. 
A. Hyperkalemic metabolic alkosis, B. Hyperkalemic metabloic acidosis, C. Hyperkalemic metabolic alkalosis with paradoxical aciduria, D. Hypokalemic metabolic alkalosis with paradoxical aciduria
D: Hypokalemic metabolic alkalosis with paradoxical aciduria
Answer: D: Hypokalemic metabolic alkalosis with paradoxical aciduria 
Explanation: In Hypertrophic pyloric stenosis dehydration causes hypokalemic, hypochloremic metabolic alkalosis with paradoxical aciduria.