Question: what is the role of vinegar in mayonnaise
[{'answer': 'acid', 'provenance': [{'wikipedia_id': '61933', 'title': 'Mayonnaise', 'start_paragraph_id': 1, 'start_character': 188, 'end_paragraph_id': 1, 'end_character': 192, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '61933', 'title': 'Mayonnaise', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 492, 'bleu_score': 0.83539842716673, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16778042624320266090}, 'section': 'Section::::Abstract.'}]}]