Question: the involuntary movement of the bolus through the digestive system is known as
[{'answer': 'Peristaltic movement', 'provenance': [{'wikipedia_id': '156932', 'title': 'Peristalsis', 'start_paragraph_id': 2, 'start_character': 289, 'end_paragraph_id': 2, 'end_character': 309, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '156932', 'title': 'Peristalsis', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 490, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14643524825235537602}, 'section': 'Section::::Abstract.'}]}]