This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Benign Gastric Disease, Subject name: Surgery
Hypochloremia, hypokalemia and alkalosis are seen in: 
Select and explain. 
A. Congenital hypertrophic pyloric stenosis, B. Hirschsprung's disease., C. Esophageal atresia, D. Jejunal atresia
A: Congenital hypertrophic pyloric stenosis
Answer: A: Congenital hypertrophic pyloric stenosis 
Explanation: Ans. is 'a' i.e. Congenital hypertrophic pyloric stenosis Biochemical abnormality in congenital hypertrophic pyloric stenosis is a regular feature of AIIMS and AI examinations it has been repeated several times.The biochemical abnormality seen are:HypokalemiaHypochloremiaAlkalosis andParadoxical aciduriaThis topic has been discussed in detail earlier.