Question: what is the name of nigeria president wife
[{'answer': 'Aisha Buhari', 'provenance': [{'wikipedia_id': '36554642', 'title': 'First Lady of Nigeria', 'start_paragraph_id': 1, 'start_character': 134, 'end_paragraph_id': 1, 'end_character': 146, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '36554642', 'title': 'First Lady of Nigeria', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 187, 'bleu_score': 0.9451524926983921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2624102420659483811}, 'section': 'Section::::Abstract.'}]}]