Question: when was the wheels on the bus written
[{'answer': 'no later than 1939'}, {'provenance': [{'wikipedia_id': '18573443', 'title': 'The Wheels on the Bus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 599, 'bleu_score': 0.912788294282273, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2212028469508236649}, 'section': 'Section::::Abstract.'}]}]