Question: who sang yesterday all my troubles seemed so far away
[{'answer': 'McCartney', 'provenance': [{'wikipedia_id': '143184', 'title': 'Yesterday (Beatles song)', 'start_paragraph_id': 1, 'start_character': 76, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '143184', 'title': 'Yesterday (Beatles song)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 656, 'bleu_score': 0.9829771687435411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18151028253928440974}, 'section': 'Section::::Abstract.'}]}]