Question: what is the name of the first nigerian president
[{'answer': 'Nnamdi Azikiwe', 'provenance': [{'wikipedia_id': '516088', 'title': 'President of Nigeria', 'start_paragraph_id': 1, 'start_character': 332, 'end_paragraph_id': 1, 'end_character': 346, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '516088', 'title': 'President of Nigeria', 'start_paragraph_id': 1, 'start_character': 52, 'end_paragraph_id': 1, 'end_character': 607, 'bleu_score': 0.820043820590149, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17389542493282403735}, 'section': 'Section::::Abstract.'}]}]