This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
The most important buffer in RBC is 
Select and explain. 
A. O2Hb + Na hemoglobinate, B. O2Hb + K hemoglobinate, C. H2CO3 + KHCO3, D. H2CO3 + NaHCO3
D: H2CO3 + NaHCO3
Answer: D: H2CO3 + NaHCO3 
Explanation: None