Question: who led the ussr during the cuban missile crisis
[{'answer': 'Krushchev'}, {'provenance': [{'wikipedia_id': '6827', 'title': 'Cuban Missile Crisis', 'start_paragraph_id': 156, 'start_character': 0, 'end_paragraph_id': 156, 'end_character': 1082, 'bleu_score': 0.8553321245134821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11023210545079925407}, 'section': 'Section::::Aftermath.:Soviet leadership.\n'}]}]