Question: who is known as the king of rock
[{'answer': 'Elvis Aaron Presley', 'provenance': [{'wikipedia_id': '9288', 'title': 'Elvis Presley', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9288', 'title': 'Elvis Presley', 'start_paragraph_id': 1, 'start_character': 6, 'end_paragraph_id': 1, 'end_character': 286, 'bleu_score': 0.8123663107361161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15645122942495041637}, 'section': 'Section::::Abstract.'}]}]