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
In proximal tubule, HCO3 is absorbed with the step of 
Select and explain. 
A. Na+ Cl cotranspoer, B. Na+ - K+2Cl contraspoer, C. Na+ - H+ exchanger, D. Na+ -K+ exchanger
C: Na+ - H+ exchanger
Answer: C: Na+ - H+ exchanger 
Explanation: HCO3 is absorbed with the step of Na+ - H+ exchanger Ref: Ganong's review of medical physiology; 24th edition; page no; 680 Ref of imag :