Question: who has won the wwe world heavyweight championship the most
[{'answer': 'John Cena', 'provenance': [{'wikipedia_id': '690083', 'title': 'List of WWE Champions', 'start_paragraph_id': 2, 'start_character': 66, 'end_paragraph_id': 2, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]