Question: what is the full name of nigeria president
[{'answer': 'Muhammadu Buhari', 'provenance': [{'wikipedia_id': '551129', 'title': 'Muhammadu Buhari', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '551129', 'title': 'Muhammadu Buhari', 'start_paragraph_id': 1, 'start_character': 17, 'end_paragraph_id': 1, 'end_character': 388, 'bleu_score': 0.881546028753298, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1868703768512056631}, 'section': 'Section::::Abstract.'}]}]