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
Hypochloremia, hypokalemia and alkalosis are seen in? 
Select and explain. 
A. Congenital hyperophic pyloric stenosis, B. Hirschsprung's disease., C. Esophageal atresia, D. Jejunal atresia
A: Congenital hyperophic pyloric stenosis
Answer: A: Congenital hyperophic pyloric stenosis 
Explanation: Ans is 'a' i.e. Congenital hyperophic pyloric stenosis Biochemical abnormality in congenital hyperophic pyloric stenosis is a regular feature of AIIMS and AI examinations it has been repeated several times. The biochemical abnormalities seen are: ( I ) Hypokalemia (3) Alkalosis and (2) Hypochloremia (4) Paradoxical aciduria