Question: who was the emperor of rome when pompeii was destroyed
[{'answer': 'Titus', 'provenance': [{'wikipedia_id': '55251', 'title': 'Titus', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 5, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55251', 'title': 'Titus', 'start_paragraph_id': 49, 'start_character': 0, 'end_paragraph_id': 49, 'end_character': 717, 'bleu_score': 0.90514792831251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5311790227882668447}, 'section': 'Section::::Emperor (79–81).:Challenges.\n'}]}]