Question: when was the constitution of india finally signed
[{'answer': '26 November 1949', 'provenance': [{'wikipedia_id': '315776', 'title': 'Constitution of India', 'start_paragraph_id': 3, 'start_character': 55, 'end_paragraph_id': 3, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]