Question: who became the first leader of the united russia
[{'answer': 'Sergei Shoigu', 'provenance': [{'wikipedia_id': '396334', 'title': 'United Russia', 'start_paragraph_id': 6, 'start_character': 658, 'end_paragraph_id': 6, 'end_character': 671, 'bleu_score': 1.0, 'section': 'Section::::History.:Origins.\n'}]}, {'provenance': [{'wikipedia_id': '396334', 'title': 'United Russia', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 705, 'bleu_score': 0.9826823455989031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10615216804608305173}, 'section': 'Section::::History.:Origins.\n'}]}]