Question: this architect is famous for his work on the flatiron building in new york city
[{'answer': 'Daniel Burnham', 'provenance': [{'wikipedia_id': '253850', 'title': 'Flatiron Building', 'start_paragraph_id': 6, 'start_character': 168, 'end_paragraph_id': 6, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Site.\n'}]}, {'answer': 'Frederick Dinkelberg'}]