Question: when was the last time virginia won the acc championship
[{'answer': '2018', 'provenance': [{'wikipedia_id': '7915778', 'title': "Virginia Cavaliers men's basketball", 'start_paragraph_id': 9, 'start_character': 1018, 'end_paragraph_id': 9, 'end_character': 1022, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]