Question: where did the saying man best friend come from
[{'answer': 'Frederick the Great of Prussia', 'provenance': [{'wikipedia_id': '1061725', 'title': "Man's best friend (phrase)", 'start_paragraph_id': 1, 'start_character': 211, 'end_paragraph_id': 1, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1061725', 'title': "Man's best friend (phrase)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 347, 'bleu_score': 0.9669306597086381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3649139051990837678}, 'section': 'Section::::Abstract.'}]}]