Question: where does the mac in fleetwood mac come from
[{'answer': 'John McVie', 'provenance': [{'wikipedia_id': '11787', 'title': 'Fleetwood Mac', 'start_paragraph_id': 2, 'start_character': 113, 'end_paragraph_id': 2, 'end_character': 123, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11787', 'title': 'Fleetwood Mac', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 274, 'bleu_score': 0.8977528478480281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13880439981436831202}, 'section': 'Section::::History.:1967–1970: Formation and early years.\n'}]}]