The internal secretion of ............ helps in digestion.

Citric acid

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Sulphuric acid

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Acetic acid

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Hydrochloric acid

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Solution

The correct option is C Hydrochloric acid
The stomach wall secretes gastric juices and a mixture of HCl, pepsinogen and mucous. HCl increases the pH of the stomach due to which pepsinogen gets activated and gets converted into the active form pepsin which digests the protein molecule. Thus, the correct answer is option D.

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