The buffer system which helps to maintain the $pH$ of blood between $7.26$ to $7.42$ is:
- A$H_2CO_3 / HCO_3^{-}$
- B$NH_4OH / NH_4Cl$
- C$CH_3COOH / CH_3COO^{-}$
- D$CH_3COONH_4$
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