Question: when did the free school lunch program start
[{'answer': 'June 4 , 1946', 'provenance': [{'wikipedia_id': '1780688', 'title': 'National School Lunch Act', 'start_paragraph_id': 1, 'start_character': 580, 'end_paragraph_id': 1, 'end_character': 593, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1780688', 'title': 'National School Lunch Act', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 592, 'bleu_score': 0.965324401462693, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10708875186816672670}, 'section': 'Section::::Abstract.'}]}]