Question: name the type of muscles that accomplish peristalsis
[{'answer': 'circular smooth muscles', 'provenance': [{'wikipedia_id': '156932', 'title': 'Peristalsis', 'start_paragraph_id': 2, 'start_character': 334, 'end_paragraph_id': 2, 'end_character': 357, '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': 8862280851667406530}, 'section': 'Section::::Abstract.'}]}]