Correct Answer: Option C

Explanation

Pepsin is secreted as an inactive precursor, called pepsinogen to prevent it from digesting the cells and tissues that produce it.

By secreting pepsinogen, the stomach can control the activation of pepsin which usually occurs whenever pepsinogen comes in contact with Hydrochloric acid in the stomach. The acid environment triggers a conformational change in pepsinogen,allowing it to convert into pepsin.

This mechanism ensures that pepsin is only activated when it is needed. i.e Whenever food is ingested through the mouth and gets into the stomach, and helps protect the stomach lining and other tissues from damage.

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