Question: who are the current members of the nitty gritty dirt band
[{'answer': 'Jeff Hanna', 'provenance': [{'wikipedia_id': '404924', 'title': 'Nitty Gritty Dirt Band', 'start_paragraph_id': 2, 'start_character': 60, 'end_paragraph_id': 2, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Jimmie Fadden', 'provenance': [{'wikipedia_id': '404924', 'title': 'Nitty Gritty Dirt Band', 'start_paragraph_id': 2, 'start_character': 83, 'end_paragraph_id': 2, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Bob Carpenter', 'provenance': [{'wikipedia_id': '404924', 'title': 'Nitty Gritty Dirt Band', 'start_paragraph_id': 2, 'start_character': 263, 'end_paragraph_id': 2, 'end_character': 276, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]