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: Pharmacology
[{'content': "Contents of Ringer's lactate are all except: September 2010 \nSelect and explain. \nA. Sodium ion, B. Potassium ion, C. Chloride ion, D. Bicarbonate ion", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. D: Bicarbonate ion One litre of lactated Ringer's solution contains: 130 mEq of sodium ion = 130 mmol/L 109 mEq of chloride ion = 109 mmol/L 28 mEq of lactate = 28 mmol/L 4 mEq of potassium ion = 4 mmol/L 3 mEq of calcium ion = 1.5 mmol/L", 'role': 'assistant'}]