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': 'Bicarbonate is maximally absorbed in \nSelect and explain. \nA. PCT, B. DCT, C. Thick ascending loop of Henle, D. Collecting duct', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hco3 is absorbed in th PCT. Ref: guyton and hall textbook of medical physiology 12 edition page number:475,476,477', 'role': 'assistant'}]