Question: when was the first session of the constituent assembly held
[{'answer': 'December 1946 (', 'provenance': [{'wikipedia_id': '1589530', 'title': 'Constituent Assembly of India', 'start_paragraph_id': 4, 'start_character': 901, 'end_paragraph_id': 4, 'end_character': 914, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]