Question: when did the constituent assembly become a sovereign body
[{'answer': '14 August 1947', 'provenance': [{'wikipedia_id': '1589530', 'title': 'Constituent Assembly of India', 'start_paragraph_id': 4, 'start_character': 932, 'end_paragraph_id': 4, 'end_character': 946, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1589530', 'title': 'Constituent Assembly of India', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1539, 'bleu_score': 0.9738631281906501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3098592591416331041}, 'section': 'Section::::Abstract.'}]}]