Question: what organ contains bacteria that help produce vitamin k
[{'answer': 'gut', 'provenance': [{'wikipedia_id': '32541', 'title': 'Vitamin K', 'start_paragraph_id': 4, 'start_character': 16, 'end_paragraph_id': 4, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32541', 'title': 'Vitamin K', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 545, 'bleu_score': 0.744580805390985, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1172584654383213224}, 'section': 'Section::::Abstract.'}]}]