Question: what is the name of the protease which is released in the stomach
[{'answer': 'Pepsin', 'provenance': [{'wikipedia_id': '1057785', 'title': 'Digestive enzyme', 'start_paragraph_id': 21, 'start_character': 125, 'end_paragraph_id': 21, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Stomach.\n'}]}, {'provenance': [{'wikipedia_id': '1057785', 'title': 'Digestive enzyme', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10843593834056428966}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1057785', 'title': 'Digestive enzyme', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 481, 'bleu_score': 0.940033794885305, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10843593834056428966}, 'section': 'Section::::Stomach.\n'}]}, {'provenance': [{'wikipedia_id': '169118', 'title': 'Pepsin', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Pepsin is an endopeptidase that breaks down proteins into smaller peptides (that is, a protease). It is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food.', 'Pepsin is an endopeptidase that breaks down proteins into smaller peptides (that is, a protease). It is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food. Pepsin is an aspartic protease, using a catalytic aspartate in its active site. It is one of three principal proteases in the human digestive system, the other two being chymotrypsin and trypsin. During the process of digestion, these enzymes, each of', 'Pepsin is an endopeptidase that breaks down proteins into smaller peptides (that is, a protease). It is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food. Pepsin is an aspartic protease, using a catalytic aspartate in its active site.']}}]}, {'provenance': [{'wikipedia_id': '169118', 'title': 'Pepsin', 'section': 'Section::::Precursor.\n', 'start_paragraph_id': 9, 'end_paragraph_id': 9, 'meta': {'evidence_span': ['In 1928, it became one of the first enzymes to be crystallized when John H. Northrop crystallized it using dialysis, filtration, and cooling. Pepsin is expressed as a zymogen called pepsinogen, whose primary structure has an additional 44 amino acids. In the stomach, chief cells release pepsinogen.', 'In 1928, it became one of the first enzymes to be crystallized when John H. Northrop crystallized it using dialysis, filtration, and cooling. Pepsin is expressed as a zymogen called pepsinogen, whose primary structure has an additional 44 amino acids. In the stomach, chief cells release pepsinogen.', 'Pepsin is expressed as a zymogen called pepsinogen, whose primary structure has an additional 44 amino acids. In the stomach, chief cells release pepsinogen.']}}]}, {'provenance': [{'wikipedia_id': '1057785', 'title': 'Digestive enzyme', 'section': 'Section::::Stomach.\n', 'start_paragraph_id': 21, 'end_paragraph_id': 21, 'meta': {'evidence_span': ['Pepsin is the main gastric enzyme. It is produced by the stomach cells called "chief cells" in its inactive form pepsinogen, which is a zymogen.', 'BULLET::::- Pepsin is the main gastric enzyme. It is produced by the stomach cells called "chief cells" in its inactive form pepsinogen, which is a zymogen. Pepsinogen is then activated by the stomach acid into its active form, pepsin. Pepsin breaks down the protein in the food into smaller particles, such as peptide fragments and amino acids. Protein digestion, therefore, primarily starts in the stomach, unlike carbohydrate and lipids, which start their digestion in the mouth (however, trace amounts of the enzyme kallikrein, which catabolises certain protein, is found in saliva in the mouth).', 'Pepsin is the main gastric enzyme. It is produced by the stomach cells called "chief cells" in its inactive form pepsinogen, which is a zymogen.']}}]}]