Question: who is the duke speaking to in the poem my last duchess
[{'answer': 'Nikolaus Madruz', 'provenance': [{'wikipedia_id': '1465758', 'title': 'My Last Duchess', 'start_paragraph_id': 4, 'start_character': 744, 'end_paragraph_id': 4, 'end_character': 759, 'bleu_score': 1.0, 'section': 'Section::::Historical background.\n'}]}, {'provenance': [{'wikipedia_id': '1465758', 'title': 'My Last Duchess', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 846, 'bleu_score': 0.969191309144216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7964550846154435451}, 'section': 'Section::::Historical background.\n'}]}]