Question: when was the first coliseum built in rome
[{'answer': 'AD 80', 'provenance': [{'wikipedia_id': '49603', 'title': 'Colosseum', 'start_paragraph_id': 1, 'start_character': 511, 'end_paragraph_id': 1, 'end_character': 516, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49603', 'title': 'Colosseum', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 771, 'bleu_score': 0.797425208539378, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10405960601955298317}, 'section': 'Section::::Abstract.'}]}]