This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Body composition and Acid base Balance, Subject name: Pediatrics
Which of the following is not a cause of chloride responsive metabolic alkalosis? 
Select and explain. 
A. Vomiting, B. Cystic fibrosis, C. Post hypercapnia syndrome, D. Congenital adrenal hyperplasia
D: Congenital adrenal hyperplasia
Answer: D: Congenital adrenal hyperplasia 
Explanation: Congenital adrenal hyperplasia: causes chloride resistant metabolic alkalosis