Question: who gave the industrial era the title the gilded age
[{'answer': 'Mark Twain', 'provenance': [{'wikipedia_id': '485133', 'title': 'Gilded Age', 'start_paragraph_id': 1, 'start_character': 214, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '485133', 'title': 'Gilded Age', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 650, 'bleu_score': 0.8823084657258701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3166387154442287778}, 'section': 'Section::::Abstract.'}]}]