Question: who is the longest reigning champion in wwe
[{'answer': 'Bruno Sammartino', 'provenance': [{'wikipedia_id': '690083', 'title': 'List of WWE Champions', 'start_paragraph_id': 3, 'start_character': 370, 'end_paragraph_id': 3, 'end_character': 386, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]