Question: how many triple doubles has lebron james had in his career
[{'answer': '64', 'provenance': [{'wikipedia_id': '11012104', 'title': 'List of career achievements by LeBron James', 'start_paragraph_id': 9, 'start_character': 41, 'end_paragraph_id': 9, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::NBA career statistics.:Career ranking.\n'}]}]