Which of the following pairs of species is used in the preparation of antacid medicines?
- A$NaHCO_3$ and $Mg(OH)_2$
- B$Na_2CO_3$ and $Ca(HCO_3)_2$
- C$Ca(HCO_3)_2$ and $Mg(OH)_2$
- D$Ca(OH)_2$ and $NaHCO_3$
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