Question: who hired leonardo da vinci to paint the last supper
[{'answer': 'Ludovico Sforza', 'provenance': [{'wikipedia_id': '73190', 'title': 'The Last Supper (Leonardo)', 'start_paragraph_id': 2, 'start_character': 171, 'end_paragraph_id': 2, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '73190', 'title': 'The Last Supper (Leonardo)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 462, 'bleu_score': 0.776944387934779, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11995507666355292987}, 'section': 'Section::::Abstract.'}]}]