To answer this question, you need to understand the enzymes involved in protein digestion.
Option A) Pepsin - This option is correct. Pepsin is an enzyme produced in the stomach that breaks down proteins into smaller peptides, including peptones. It works best in an acidic environment.
Option B) Trypsin - This option is incorrect. Trypsin is an enzyme produced in the pancreas that further breaks down peptides into smaller units called amino acids. It does not convert proteins into peptones.
Option C) Erepsin - This option is incorrect. Erepsin is an enzyme produced in the small intestine that helps in the final breakdown of peptides into individual amino acids. It does not convert proteins into peptones.
Option D) Enterokinase - This option is incorrect. Enterokinase is an enzyme produced in the small intestine that activates trypsinogen into trypsin. It does not convert proteins into peptones.
The correct answer is A) Pepsin. This option is correct because pepsin is the enzyme responsible for converting proteins into peptones in the stomach.