Question: when did lebron james win his first nba finals
[{'answer': '2012', 'provenance': [{'wikipedia_id': '240940', 'title': 'LeBron James', 'start_paragraph_id': 3, 'start_character': 78, 'end_paragraph_id': 3, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]