Question: when was the last time nigeria won the world cup
[{'answer': '2018', 'provenance': [{'wikipedia_id': '41788342', 'title': 'Nigeria at the FIFA World Cup', 'start_paragraph_id': 3, 'start_character': 198, 'end_paragraph_id': 3, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]