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
Absorption of all occurs in PCT except 
Select and explain. 
A. PO4, B. Glucose, C. HCO3-, D. H+
D: H+
Answer: D: H+ 
Explanation: In PCT there is maximum secretion of H+, around 4200 mEq/day Ref: Ganong -23rd edition, Page 665