Question: at what age did lebron james enter the nba
[{'answer': '19', 'provenance': [{'wikipedia_id': '240940', 'title': 'LeBron James', 'start_paragraph_id': 1, 'start_character': 46, 'end_paragraph_id': 1, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '240940', 'title': 'LeBron James', 'start_paragraph_id': 64, 'start_character': 0, 'end_paragraph_id': 64, 'end_character': 1167, 'bleu_score': 0.771869835045861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 215746027079111919}, 'section': 'Section::::Player profile.:Offense.\n'}]}]