Question: who played glinda the good witch on the wizard of oz
[{'answer': "`` Billie '' Burke"}, {'provenance': [{'wikipedia_id': '487473', 'title': 'Billie Burke', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 324, 'bleu_score': 0.7827314506328381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9134901311260933220}, 'section': 'Section::::Abstract.'}]}]