Question: where does bacteria in the mouth come from
[{'answer': 'saliva', 'provenance': [{'wikipedia_id': '20630639', 'title': 'Oral ecology', 'start_paragraph_id': 1, 'start_character': 189, 'end_paragraph_id': 1, 'end_character': 195, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20630639', 'title': 'Oral ecology', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1676, 'bleu_score': 0.9751565957424251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16954976767505988017}, 'section': 'Section::::Bacterial growth.\n'}]}]