Question: what is the name of the turkish city formerly known as constantinople
[{'answer': 'İstanbul', 'provenance': [{'wikipedia_id': '5646', 'title': 'Constantinople', 'start_paragraph_id': 16, 'start_character': 39, 'end_paragraph_id': 16, 'end_character': 47, 'bleu_score': 1.0, 'section': 'Section::::Names.:Modern names of the city.\n'}]}, {'provenance': [{'wikipedia_id': '5646', 'title': 'Constantinople', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 780, 'bleu_score': 0.900352607367712, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11483814552531542114}, 'section': 'Section::::Names.:Modern names of the city.\n'}]}]