Question: when did the first happy meal come out
[{'answer': 'October 1977', 'provenance': [{'wikipedia_id': '484398', 'title': 'Happy Meal', 'start_paragraph_id': 7, 'start_character': 1228, 'end_paragraph_id': 7, 'end_character': 1240, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '484398', 'title': 'Happy Meal', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 1307, 'bleu_score': 0.9669907463589961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12475049191878011510}, 'section': 'Section::::History.\n'}]}]