Question: who played the wicked witch of the west on wizard of oz
[{'answer': 'Margaret Brainard Hamilton', 'provenance': [{'wikipedia_id': '589885', 'title': 'Margaret Hamilton (actress)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '589885', 'title': 'Margaret Hamilton (actress)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 245, 'bleu_score': 0.866670410327797, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 413988226281498835}, 'section': 'Section::::Abstract.'}]}]