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': 'Least reabsorption out of \nSelect and explain. \nA. Glucose, B. Urea, C. Na+, D. HCO3', 'role': 'user'}, {'content': "Answer: B \nExplanation: Reabsorption the flow of glomerular filtrate from the proximal tubule of the nephron into the peritubular capillaries, which allows the selective passage of ceain substances (glucose, proteins, sodium) back into the circulation. Urea is least reabsorbed as it is excreted out. Ref: Ganong's review of medical physiology; 24th edition", 'role': 'assistant'}]