Question: who wrote the wealth of nations and claimed that a laissez-faire economic policy is the best
[{'answer': 'Adam Smith', 'provenance': [{'wikipedia_id': '165451', 'title': 'Laissez-faire', 'start_paragraph_id': 2, 'start_character': 105, 'end_paragraph_id': 2, 'end_character': 115, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '165451', 'title': 'Laissez-faire', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 847, 'bleu_score': 0.965664648905967, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12038285322138156564}, 'section': 'Section::::History of "laissez-faire" debate.:Europe.\n'}]}]