Question: where is pepsin secreted in the digestive system
[{'answer': 'stomach', 'provenance': [{'wikipedia_id': '169118', 'title': 'Pepsin', 'start_paragraph_id': 1, 'start_character': 120, 'end_paragraph_id': 1, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '169118', 'title': 'Pepsin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 350, 'bleu_score': 0.5523556105525701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14105338618417475761}, 'section': 'Section::::Abstract.'}]}]