Question: who are the democratic candidates running for governor in tennessee
[{'answer': 'Karl Dean', 'provenance': [{'wikipedia_id': '49235903', 'title': '2018 Tennessee gubernatorial election', 'start_paragraph_id': 1, 'start_character': 191, 'end_paragraph_id': 1, 'end_character': 200, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]