Question: when did texas change the drinking age to 21
[{'answer': '1986', 'provenance': [{'wikipedia_id': '19197423', 'title': 'U.S. history of alcohol minimum purchase age by state', 'start_paragraph_id': 4, 'start_character': 312, 'end_paragraph_id': 4, 'end_character': 316, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]