This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Which metabolic abnormality is seen in congenital hyperophic pyloric stenosis? \nSelect and explain. \nA. Metabolic Acidosis, B. Metabolic Alkalosis, C. Respiratory Acidosis, D. Respiratory Alkalosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Repetitive vomiting leads to hypochloremic, hypokalemic metabolic alkalosis. The urine is alkaline initially but eventually it becomes acidic (paradoxical aciduria) Cause of paradoxical aciduria Initially the kidney compensate for metabolic alkalosis by reabsorbing hydrogen and chloride ions in exchange for sodium, potassium and bicarbonate. But gradually as the body stores of sodium and especially potassium become depleted, kidney stas retaining these ions in exchange of hydrogen ions, thus the urine becomes acidic and metabolic alkaline state is fuher aggravated. Reference: SRB edition: 5th page no:830', 'role': 'assistant'}]