Question: when did armenia gain independence from the soviet union
[{'answer': '21 September 1991', 'provenance': [{'wikipedia_id': '10918072', 'title': 'Armenia', 'start_paragraph_id': 58, 'start_character': 3, 'end_paragraph_id': 58, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::History.:Restoration of independence.\n'}]}]