Question: who sings the song mary did you know
[{'answer': 'Michael English', 'provenance': [{'wikipedia_id': '2859825', 'title': 'Mary, Did You Know?', 'start_paragraph_id': 1, 'start_character': 219, 'end_paragraph_id': 1, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2859825', 'title': 'Mary, Did You Know?', 'start_paragraph_id': 1, 'start_character': 74, 'end_paragraph_id': 1, 'end_character': 613, 'bleu_score': 0.704900657049042, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12387492061498782117}, 'section': 'Section::::Abstract.'}]}]