Question: the old greek city-state of byzantium was rebuilt and became known as
[{'answer': 'Constantinople', 'provenance': [{'wikipedia_id': '3719', 'title': 'Byzantium', 'start_paragraph_id': 1, 'start_character': 130, 'end_paragraph_id': 1, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Istanbul', 'provenance': [{'wikipedia_id': '3719', 'title': 'Byzantium', 'start_paragraph_id': 1, 'start_character': 155, 'end_paragraph_id': 1, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]