Question: who were the female singers in fleetwood mac
[{'answer': 'Stevie Nicks', 'provenance': [{'wikipedia_id': '11787', 'title': 'Fleetwood Mac', 'start_paragraph_id': 3, 'start_character': 125, 'end_paragraph_id': 3, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Christine McVie', 'provenance': [{'wikipedia_id': '11787', 'title': 'Fleetwood Mac', 'start_paragraph_id': 3, 'start_character': 985, 'end_paragraph_id': 3, 'end_character': 1000, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]