Question: who did the tennessee titans used to be
[{'answer': 'Houston Oilers', 'provenance': [{'wikipedia_id': '30839', 'title': 'Tennessee Titans', 'start_paragraph_id': 1, 'start_character': 250, 'end_paragraph_id': 1, 'end_character': 264, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30839', 'title': 'Tennessee Titans', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 476, 'bleu_score': 0.9751504244977051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17001273614034409910}, 'section': 'Section::::Abstract.'}]}]