Question: what's the largest pizza chain in america
[{'answer': 'Pizza Hut', 'provenance': [{'wikipedia_id': '1790687', 'title': 'Little Caesars', 'start_paragraph_id': 1, 'start_character': 128, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1790687', 'title': 'Little Caesars', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 524, 'bleu_score': 0.9757530668325981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 135808525431766736}, 'section': 'Section::::Abstract.'}]}]