Question: who sold the most rock albums in history
[{'answer': 'Michael Jackson', 'provenance': [{'wikipedia_id': '3329753', 'title': 'List of best-selling albums', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3329753', 'title': 'List of best-selling albums', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 389, 'bleu_score': 0.8227291877429521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2776930620507312050}, 'section': 'Section::::Abstract.'}]}]