Question: who sang the theme song to beverly hillbillies
[{'answer': 'Jerry Scoggins', 'provenance': [{'wikipedia_id': '2535443', 'title': 'The Ballad of Jed Clampett', 'start_paragraph_id': 2, 'start_character': 21, 'end_paragraph_id': 2, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]