This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluids and Electrolyte Imbalance, Subject name: Medicine
[{'content': 'The Maximum concentration of potassium that can be delivered central vein is? \nSelect and explain. \nA. 20 mmol/L, B. 40 mmol/L, C. 60 mmol/L, D. 100 mmol/L4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Maximum concentration possible delivered central vein = 60 mmol/L Maximum concentration possible delivered peripheral vein= 40 mmol/L', 'role': 'assistant'}]