Which of the following represents the complete chemical reaction for the bicarbonate buffer system?
A. CO2 + H2O 
HCO3- + H+
B. CO2 + H2O 
H2CO3 
HCO3- + H+
C. H2CO3 
HCO3- + H+
D. CO2 + H2O 
HCO3- + H+ 
H2CO3
E. H2CO3 
CO2 + H2O 
HCO3- + H+
Answer: B
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