Question: what time period did the t rex live in
[{'answer': 'Cretaceous Period', 'provenance': [{'wikipedia_id': '30467', 'title': 'Tyrannosaurus', 'start_paragraph_id': 1, 'start_character': 514, 'end_paragraph_id': 1, 'end_character': 531, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30467', 'title': 'Tyrannosaurus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 651, 'bleu_score': 0.8813413467520681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2464178876990573108}, 'section': 'Section::::Abstract.'}]}]