Question: when did justin timberlake become a solo artist
[{'answer': '2002', 'provenance': [{'wikipedia_id': '69323', 'title': 'Justin Timberlake', 'start_paragraph_id': 1, 'start_character': 595, 'end_paragraph_id': 1, 'end_character': 599, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '69323', 'title': 'Justin Timberlake', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 716, 'bleu_score': 0.9380045441743801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6670124024311524430}, 'section': 'Section::::Abstract.'}]}]