Pepsin is an enzyme which acts in

acidic medium in the stomach

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alkaline medium in the stomach

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alkaline medium in the duodenum

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acidic medium in the duodenum

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Solution

The correct option is C acidic medium in the stomach
Pepsin is an enzyme which is released by zymogenic cells, the chief cells in the stomach and that degrades food proteins into peptides.
It is most active in acidic environments.
It exhibits maximal activity at pH 2.0 and is inactive at pH 6.5. Hence, Pepsin is an enzyme which acts in an acidic medium in the stomach.
So, the correct answer is 'acidic medium in the stomach'.

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