Question: when did the ottoman empire take over the byzantine empire
[{'answer': '29 May 1453', 'provenance': [{'wikipedia_id': '102674', 'title': 'Fall of Constantinople', 'start_paragraph_id': 1, 'start_character': 148, 'end_paragraph_id': 1, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]