Question: where does the chemical breakdown of food begin
[{'answer': 'in the mouth', 'provenance': [{'wikipedia_id': '165423', 'title': 'Digestion', 'start_paragraph_id': 57, 'start_character': 97, 'end_paragraph_id': 57, 'end_character': 109, 'bleu_score': 1.0, 'section': 'Section::::Overview of vertebrate digestion.\n'}]}, {'provenance': [{'wikipedia_id': '165423', 'title': 'Digestion', 'start_paragraph_id': 57, 'start_character': 0, 'end_paragraph_id': 57, 'end_character': 528, 'bleu_score': 0.9754554449993441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10789877875647120804}, 'section': 'Section::::Overview of vertebrate digestion.\n'}]}]