Question: when was the last time the colosseum was used
[{'answer': 'in the early medieval era', 'provenance': [{'wikipedia_id': '49603', 'title': 'Colosseum', 'start_paragraph_id': 2, 'start_character': 514, 'end_paragraph_id': 2, 'end_character': 539, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49603', 'title': 'Colosseum', 'start_paragraph_id': 2, 'start_character': 38, 'end_paragraph_id': 2, 'end_character': 678, 'bleu_score': 0.849005223096135, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6325340630023756638}, 'section': 'Section::::Abstract.'}]}]