Question: who's won more super bowls afc or nfc
[{'answer': 'NFC', 'provenance': [{'wikipedia_id': '2145410', 'title': 'List of Super Bowl champions', 'start_paragraph_id': 1, 'start_character': 560, 'end_paragraph_id': 1, 'end_character': 563, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]