Question: how many countries negotiated the iran nuclear deal
[{'answer': 'Germany', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 293, 'end_paragraph_id': 1, 'end_character': 300, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'China', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 282, 'end_paragraph_id': 1, 'end_character': 287, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'France', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 270, 'end_paragraph_id': 1, 'end_character': 276, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Russia', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 262, 'end_paragraph_id': 1, 'end_character': 268, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the United Kingdom', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 242, 'end_paragraph_id': 1, 'end_character': 260, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the United States', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 223, 'end_paragraph_id': 1, 'end_character': 240, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Islamic Republic of Iran', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 98, 'end_paragraph_id': 1, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'European Union', 'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 310, 'end_paragraph_id': 1, 'end_character': 324, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46304204', 'title': 'Iran nuclear deal framework', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 324, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5925303946450662316}, 'section': 'Section::::Abstract.'}]}]