Question: who is the original singer of sitting on the dock of the bay
[{'answer': 'Otis Redding', 'provenance': [{'wikipedia_id': '47430882', 'title': "(Sittin' On) The Dock of the Bay", 'start_paragraph_id': 1, 'start_character': 71, 'end_paragraph_id': 1, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47430882', 'title': "(Sittin' On) The Dock of the Bay", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 383, 'bleu_score': 0.936655266249045, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6214129063029812275}, 'section': 'Section::::Abstract.'}]}]