Question: when did nigeria win her first olympic gold medal
[{'answer': '1996', 'provenance': [{'wikipedia_id': '8284572', 'title': 'Nigeria at the Olympics', 'start_paragraph_id': 2, 'start_character': 130, 'end_paragraph_id': 2, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8284572', 'title': 'Nigeria at the Olympics', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 386, 'bleu_score': 0.630706448988684, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11658341257497036663}, 'section': 'Section::::Abstract.'}]}]