Which of the following substances are 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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