Question: what is the tallest ride at six flags over texas
[{'answer': 'Titan', 'provenance': [{'wikipedia_id': '607574', 'title': 'Six Flags Over Texas', 'start_paragraph_id': 25, 'start_character': 29, 'end_paragraph_id': 25, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::History.:2000s.\n'}]}]