This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pediatrics
[{'content': 'Which electrolyte should be replenished in hyperophic pyloric stenosis ? \nSelect and explain. \nA. Sodium, B. Hydrogen, C. Chloride, D. Bicarbonate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hypochloremic, hypokalemic metabolic alkalosis is the classic electrolyte and acid-base imbalance of pyloric stenosis. This prolonged vomiting causes progressive loss of fluids rich in hydrochloric acid, which causes the kidneys to retain hydrogen ions in or of potassium. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]