Question: the conquered city of constantinople became the capital of which empire
[{'answer': 'Ottoman', 'provenance': [{'wikipedia_id': '102674', 'title': 'Fall of Constantinople', 'start_paragraph_id': 1, 'start_character': 107, 'end_paragraph_id': 1, 'end_character': 114, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '102674', 'title': 'Fall of Constantinople', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 403, 'bleu_score': 0.536421160922614, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8342218480122205754}, 'section': 'Section::::Abstract.'}]}]