Question: where is peristalsis found in the digestive system
[{'answer': 'much of a digestive tract', 'provenance': [{'wikipedia_id': '156932', 'title': 'Peristalsis', 'start_paragraph_id': 2, 'start_character': 3, 'end_paragraph_id': 2, 'end_character': 28, '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': 9729721799232389139}, 'section': 'Section::::Abstract.'}]}]