Question: when did the executive mansion become known as the white house
[{'answer': '1901', 'provenance': [{'wikipedia_id': '33057', 'title': 'White House', 'start_paragraph_id': 3, 'start_character': 155, 'end_paragraph_id': 3, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33057', 'title': 'White House', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 767, 'bleu_score': 0.9831208473513011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5973954850226383085}, 'section': 'Section::::Early history.:Naming conventions.\n'}]}]