Question: who sang the song all about that bass
[{'answer': 'Meghan Trainor', 'provenance': [{'wikipedia_id': '43359294', 'title': 'All About That Bass', 'start_paragraph_id': 1, 'start_character': 72, 'end_paragraph_id': 1, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43359294', 'title': 'All About That Bass', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 492, 'bleu_score': 0.5682004985122371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6543764053849109332}, 'section': 'Section::::Abstract.'}]}]