This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Excretory System (Kidney, Bladder) Acid-Base Balance, Subject name: Physiology
[{'content': 'Maximum absorption of HCO3- occurs in: \nSelect and explain. \nA. PCT, B. DCT, C. collecting duct, D. ascending limb of the loop of Henle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bicarbonate: 80% of bicarbonate reabsorption occurs in the PCT, 10% in thick ascending limb of LOH, and remaining in the DCT and collecting duct. Filtered bicarbonate can be reabsorbed only when it combines with H+.', 'role': 'assistant'}]