Question: when did the kit kat bar come out
[{'answer': '29 August 1935', 'provenance': [{'wikipedia_id': '607794', 'title': 'Kit Kat', 'start_paragraph_id': 5, 'start_character': 767, 'end_paragraph_id': 5, 'end_character': 781, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '607794', 'title': 'Kit Kat', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 899, 'bleu_score': 0.9875383322810981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2412809865786663123}, 'section': 'Section::::History.\n'}]}]