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
[{'content': 'Congenital pyloric stenosis present with: \nSelect and explain. \nA. Hypokalemic metabolic acidosis, B. Hypokalemic metabolic alkalosis, C. Hyperkalemic metabolic acidosis, D. Hyperkalemic metabolic alkalosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Hypokalemic metabolic alkalosisRef: Bailey & Love 26th ed. ch 63 /1023', 'role': 'assistant'}]