Question: who painted the last supper for the convent of santa maria delle grazie in milan
[{'answer': 'Leonardo da Vinci', 'provenance': [{'wikipedia_id': '1052258', 'title': 'Santa Maria delle Grazie (Milan)', 'start_paragraph_id': 1, 'start_character': 196, 'end_paragraph_id': 1, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1052258', 'title': 'Santa Maria delle Grazie (Milan)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 255, 'bleu_score': 0.786519207164851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2528292041799734092}, 'section': 'Section::::Abstract.'}]}]