Question: which emperor built the colosseum 70 ce in rome
[{'answer': 'Vespasian', 'provenance': [{'wikipedia_id': '49603', 'title': 'Colosseum', 'start_paragraph_id': 1, 'start_character': 471, 'end_paragraph_id': 1, 'end_character': 480, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Titus', 'provenance': [{'wikipedia_id': '49603', 'title': 'Colosseum', 'start_paragraph_id': 1, 'start_character': 547, 'end_paragraph_id': 1, 'end_character': 552, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]