Question: when was jana gana mana accepted as national anthem
[{'answer': '24 January 1950', 'provenance': [{'wikipedia_id': '56280', 'title': 'Jana Gana Mana', 'start_paragraph_id': 1, 'start_character': 271, 'end_paragraph_id': 1, 'end_character': 286, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56280', 'title': 'Jana Gana Mana', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 611, 'bleu_score': 0.8807917561905311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12639416500711937202}, 'section': 'Section::::Abstract.'}]}]