Question: when was the last time notre dame won a national championship in football
[{'answer': '1988', 'provenance': [{'wikipedia_id': '1245667', 'title': 'Notre Dame Fighting Irish football', 'start_paragraph_id': 54, 'start_character': 491, 'end_paragraph_id': 54, 'end_character': 495, 'bleu_score': 1.0, 'section': 'Section::::History.:Lou Holtz era (1986–1996).\n'}]}]