Question: who was the president of the russian republic at the time of the disintegration of the soviet union
[{'answer': 'Mikhail Gorbachev', 'provenance': [{'wikipedia_id': '40494892', 'title': 'Dissolution of the Soviet Union', 'start_paragraph_id': 1, 'start_character': 761, 'end_paragraph_id': 1, 'end_character': 778, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40494892', 'title': 'Dissolution of the Soviet Union', 'start_paragraph_id': 1, 'start_character': 184, 'end_paragraph_id': 1, 'end_character': 1097, 'bleu_score': 0.782246016636942, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 311846536539058976}, 'section': 'Section::::Abstract.'}]}]