Question: who said there's no such thing as a free lunch
[{'answer': 'unknown', 'provenance': [{'wikipedia_id': '144704', 'title': "There ain't no such thing as a free lunch", 'start_paragraph_id': 1, 'start_character': 341, 'end_paragraph_id': 1, 'end_character': 348, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1930s and 1940s'}, {'provenance': [{'wikipedia_id': '144704', 'title': "There ain't no such thing as a free lunch", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 498, 'bleu_score': 0.7675391104189051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9276216775214344294}, 'section': 'Section::::Abstract.'}]}]