Question: what did the windsors change their name from
[{'answer': 'Saxe - Coburg', 'provenance': [{'wikipedia_id': '172905', 'title': 'House of Windsor', 'start_paragraph_id': 6, 'start_character': 471, 'end_paragraph_id': 6, 'end_character': 483, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'answer': 'Gotha', 'provenance': [{'wikipedia_id': '172905', 'title': 'House of Windsor', 'start_paragraph_id': 1, 'start_character': 208, 'end_paragraph_id': 1, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '172905', 'title': 'House of Windsor', 'start_paragraph_id': 2, 'start_character': 128, 'end_paragraph_id': 2, 'end_character': 677, 'bleu_score': 0.70113210053057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18371949236459590657}, 'section': 'Section::::Abstract.'}]}]