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
HCO3 is absorbed through 
Select and explain. 
A. Cortical collecting duct, B. Medullary collecting duct, C. PCT, D. DCT
C: PCT
Answer: C: PCT 
Explanation: Ans. (c) PCT