Question: who produces the most pistachios in the world
[{'answer': 'Iran', 'provenance': [{'wikipedia_id': '40584', 'title': 'Pistachio', 'start_paragraph_id': 6, 'start_character': 81, 'end_paragraph_id': 6, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]