Question: the cuban missile crisis began in 1962 when which country placed nuclear missiles in cuba
[{'answer': 'Soviet Union', 'provenance': [{'wikipedia_id': '6827', 'title': 'Cuban Missile Crisis', 'start_paragraph_id': 1, 'start_character': 201, 'end_paragraph_id': 1, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]