This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Anatomy
Hypochloremia, hypokalemia and alkalosis are seen in 
Select and explain. 
A. Hirschsprung's disease, B. Congenital hyperophic pyloric stenosis, C. Esophageal atresia, D. Jejunal atresia
B: Congenital hyperophic pyloric stenosis
Answer: B: Congenital hyperophic pyloric stenosis 
Explanation: 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: Hypokalemia Hypochloremia Alkalosis and Paradoxical aciduria Ref : Schwaz 9/e p59