This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Electrolyte Imbalance, Subject name: Medicine
[{'content': 'Calculate the anion gap from the following information: Na+ = 137 mmol/L K+ = 4 mmol/L Cl- = 110 mmol/L HCO3- = 15 mmol/I. \nSelect and explain. \nA. 22 mmol/L, B. 16 mmol/L, C. 10 mmol/L, D. 12 mmol/L', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Anion gap = Na+ - (Cl- + HCO3-) = 137 - (110 + 15) = 12 mmol/L The value of potassium is not considered in anion gap', 'role': 'assistant'}]