Question: who was the leader of the soviet union when sputnik was launched
[{'answer': 'Soviet premier Nikita Khrushchev', 'provenance': [{'wikipedia_id': '28484', 'title': 'Sputnik 1', 'start_paragraph_id': 38, 'start_character': 333, 'end_paragraph_id': 38, 'end_character': 365, 'bleu_score': 1.0, 'section': 'Section::::Launch and mission.\n'}]}, {'provenance': [{'wikipedia_id': '28484', 'title': 'Sputnik 1', 'start_paragraph_id': 38, 'start_character': 0, 'end_paragraph_id': 38, 'end_character': 365, 'bleu_score': 0.9657992495762461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8428183049978637721}, 'section': 'Section::::Launch and mission.\n'}]}]