The pair whose both species are used in ant- acid medicinal preparations is :
(a) NaHCO₃ and Mg(OH)₂
(b) Na₂CO₃ and Ca(HCO₃)₂
(c) Ca(HCO₃)₂ and Mg(OH)₂
(d) Ca(OH)₂ and NaHCO₃
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