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 absorption out of the following through the kidney is for \nSelect and explain. \nA. Glucose, B. Urea, C. Na, D. HCO3', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Urea is minimally absorbed. Ref: guyton and hall textbook of medical physiology 12 edition page number:491,492,493', 'role': 'assistant'}]