Question: who was the lead singer in i want you back
[{'answer': 'Michael Jackson', 'provenance': [{'wikipedia_id': '1689719', 'title': 'I Want You Back', 'start_paragraph_id': 4, 'start_character': 303, 'end_paragraph_id': 4, 'end_character': 318, 'bleu_score': 1.0, 'section': 'Section::::Production.\n'}]}, {'provenance': [{'wikipedia_id': '1689719', 'title': 'I Want You Back', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 318, 'bleu_score': 0.9663744727315161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4804636882801944793}, 'section': 'Section::::Production.\n'}]}]