Question: who were the leaders of the soviet union during the cuban missile crisis
[{'answer': 'Nikita Khrushchev', 'provenance': [{'wikipedia_id': '6827', 'title': 'Cuban Missile Crisis', 'start_paragraph_id': 2, 'start_character': 146, 'end_paragraph_id': 2, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Anastas Mikoyan', 'provenance': [{'wikipedia_id': '6827', 'title': 'Cuban Missile Crisis', 'start_paragraph_id': 125, 'start_character': 385, 'end_paragraph_id': 125, 'end_character': 400, 'bleu_score': 1.0, 'section': 'Section::::Crisis ends.\n'}]}, {'answer': 'Rodion Malinovsky', 'provenance': [{'wikipedia_id': '6827', 'title': 'Cuban Missile Crisis', 'start_paragraph_id': 25, 'start_character': 478, 'end_paragraph_id': 25, 'end_character': 495, 'bleu_score': 1.0, 'section': 'Section::::Soviet deployment of missiles in Cuba.\n'}]}, {'answer': 'Issa Pliyev'}, {'answer': 'Georgy Abashvili'}]