This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal Tubular Reabsorption and Secretion, Subject name: Physiology
[{'content': 'HCO3 is absorbed through \nSelect and explain. \nA. Cortical collecting duct, B. Medullary collecting duct, C. PCT, D. DCT', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) PCT', 'role': 'assistant'}]