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
[{'content': 'Metabolic changes associated with excessive vomiting includes the following \nSelect and explain. \nA. Metabolic acidosis, B. Hyperchloremia, C. Hypokalemia, D. Decreases bicarbonates', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vomiting causes loss of gastric secretions which include HCl & K+ ions, resulting in metabolic alkalosis, hypokalemia and hypochloremia. However note that the moderate to severe hypokalemia seen with excessive vomiting is not merely explained by loss of K+ ions in vomiting. "In fact the hypokalemia is primarily due to increased renal K+ excretion. Loss of gastric contents results in volume depletion and metabolic alkalosis, both of which promote Kaliuresis.', 'role': 'assistant'}]