Question: who killed macbeth in william shakespeare's play
[{'answer': "Macduff 's", 'provenance': [{'wikipedia_id': '18866', 'title': 'Macbeth', 'start_paragraph_id': 119, 'start_character': 386, 'end_paragraph_id': 119, 'end_character': 399, 'bleu_score': 1.0, 'section': 'Section::::Legacy.:Performance history.:Restoration and eighteenth century.\n'}]}, {'provenance': [{'wikipedia_id': '18866', 'title': 'Macbeth', 'start_paragraph_id': 51, 'start_character': 0, 'end_paragraph_id': 51, 'end_character': 666, 'bleu_score': 0.9256022864459621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3709761734999008915}, 'section': 'Section::::Plot.:Act V.\n'}]}]