Question: how many national championships in football does notre dame have
[{'answer': '21', 'provenance': [{'wikipedia_id': '1245667', 'title': 'Notre Dame Fighting Irish football', 'start_paragraph_id': 3, 'start_character': 25, 'end_paragraph_id': 3, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1245667', 'title': 'Notre Dame Fighting Irish football', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 556, 'bleu_score': 0.7468020770673081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8001814199369093288}, 'section': 'Section::::Abstract.'}]}]