Question: when did michael jackson start his solo career
[{'answer': '1971', 'provenance': [{'wikipedia_id': '14995351', 'title': 'Michael Jackson', 'start_paragraph_id': 2, 'start_character': 201, 'end_paragraph_id': 2, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14995351', 'title': 'Michael Jackson', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1030, 'bleu_score': 0.640590083524273, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12182483106277558912}, 'section': 'Section::::Abstract.'}]}]