Question: who sang the song all i want for christmas is a hippopotamus
[{'answer': 'Gayla Peevey', 'provenance': [{'wikipedia_id': '8429126', 'title': 'I Want a Hippopotamus for Christmas', 'start_paragraph_id': 1, 'start_character': 115, 'end_paragraph_id': 1, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8429126', 'title': 'I Want a Hippopotamus for Christmas', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 245, 'bleu_score': 0.8780099567239781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3943497966218957512}, 'section': 'Section::::Abstract.'}]}]