Question: when did lionel messi started his football career
[{'answer': '2002', 'provenance': [{'wikipedia_id': '2150841', 'title': 'Lionel Messi', 'start_paragraph_id': 9, 'start_character': 140, 'end_paragraph_id': 9, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Early life.\n'}]}, {'provenance': [{'wikipedia_id': '2150841', 'title': 'Lionel Messi', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 1165, 'bleu_score': 0.9565038021135601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10519705238988934482}, 'section': 'Section::::Early life.\n'}]}]