The pair whose both species are used in antacid medicinal preparation is:
A.$NaHC{{O}_{3}}$ and $Mg{{\left( OH \right)}_{2}}$
B.$N{{a}_{2}}C{{O}_{3}}$ and $Ca{{\left( HC{{O}_{3}} \right)}_{2}}$
C.$Ca{{\left( HC{{O}_{3}} \right)}_{2}}$ and $Mg{{\left( OH \right)}_{2}}$
D.$Ca{{\left( OH \right)}_{2}}$ and $NaHC{{O}_{3}}$

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Hint:A substance which neutralizes the acidity of the stomach is referred to as antacid. It is used to relieve indigestion, heartburn, or an upset stomach. It is used as a medication. Antacids reduce the pH level in the stomach.

Complete answer:
Antacids are used to neutralize the acidity of the stomach. It is consumed orally to relieve heartburn and indigestion. The excessive amounts of acids produced in the stomach can damage the natural mucous membrane which acts as a barrier and protects the lining of the stomach. In people with acid reflux the excessive amount of acid produced in the stomach can damage the esophagus. Alkaline ions are present in the antacids which chemically neutralizes the gastric acid of the stomach and reduces damage and pain. Other active ingredients like simethicone are formulated with antacids to control the alginic acid or gas to act as a physical barrier to acid. Heartburn is the major symptom of gastroesophageal reflux disease and indigestion. During such times, antacids are consumed. Gastric pH is increased by the non-particulate antacids which includes magnesium trisilicate and sodium citrate. The acidity in the stomach is quickly reduced by both aluminum and magnesium. Therefore, it is used in the medicinal preparation of the antacids.

So, option A is the correct option.

Note:
Although antacid is used to relive the heartburning sensation, gas, and indigestion it has several side effects of consumption. Long term use of antacid can cause kidney stones. Aluminum hydroxide is also used as an antacid and is preferred over other antacids as it is insoluble and does not increase the pH level above 7.