Question: who played barney on the andy griffith show
[{'answer': 'Jesse Donald Knotts', 'provenance': [{'wikipedia_id': '269774', 'title': 'Don Knotts', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '269774', 'title': 'Don Knotts', 'start_paragraph_id': 1, 'start_character': 43, 'end_paragraph_id': 1, 'end_character': 568, 'bleu_score': 0.7059133977080341, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14011743030399610483}, 'section': 'Section::::Abstract.'}]}]