Question: where does pepsin work in the digestive system
[{'answer': 'the stomach', 'provenance': [{'wikipedia_id': '169118', 'title': 'Pepsin', 'start_paragraph_id': 1, 'start_character': 116, 'end_paragraph_id': 1, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '169118', 'title': 'Pepsin', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 1289, 'bleu_score': 0.8948741633261811, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8731376000382736339}, 'section': 'Section::::Activity and stability.\n'}]}]