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
[{'content': 'Metabolic disturbance seen with pyloric stenosis: March 2007, March 2013 (a, b, d, e) \nSelect and explain. \nA. Hypokalemic hyponatremic alkalosis, B. Hyperkalemia, C. Hyperchloremic acidosis, D. Hypernatremia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Hypokalemic hyponatremic alkalosis', 'role': 'assistant'}]