This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
[{'content': 'In a healthy individual and a normal diet, which of the following ion is completely absorbed in tubules \nSelect and explain. \nA. Na+, B. K+, C. C-, D. HCO3-', 'role': 'user'}, {'content': 'Answer: D \nExplanation: HCO3- is completely absorbed in renal tubules during normal diet.Ref: Ganong&;s review of medical physiology; 24th edition; page no; 714', 'role': 'assistant'}]