Question: what is a pivot joint in the body
[{'answer': 'a type of synovial joint', 'provenance': [{'wikipedia_id': '5522860', 'title': 'Pivot joint', 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5522860', 'title': 'Pivot joint', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 218, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9425385712360689517}, 'section': 'Section::::Abstract.'}]}]