Answer :
The digestive system produces gastric juice. So option A is correct.
The active ingredient in gastric juice is HCl (hydrochloric acid), which is a complex combination of lipase, pepsin, and other enzymes. The primary purpose of gastric juice is to inhibit the absorption of ingested microorganisms, thus preventing the passage of harmful organisms into the intestine.
Food particles are made soluble by the gastric juice, digestion (especially of proteins) is initiated, and the contents of the stomach are converted into a semi-soluble liquid known as chyme. This allows the food to be digested by the small intestine.
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