Question: where did rub a dub dub come from
[{'answer': 'English language nursery rhyme', 'provenance': [{'wikipedia_id': '731129', 'title': 'Rub-a-dub-dub', 'start_paragraph_id': 1, 'start_character': 22, 'end_paragraph_id': 1, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '731129', 'title': 'Rub-a-dub-dub', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 245, 'bleu_score': 0.8724098885951661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2322828709262394663}, 'section': 'Section::::Abstract.'}]}]