Question: who has written the national anthem of bangladesh
[{'answer': 'Rabindranath Tagore', 'provenance': [{'wikipedia_id': '250524', 'title': 'Amar Sonar Bangla', 'start_paragraph_id': 1, 'start_character': 123, 'end_paragraph_id': 1, 'end_character': 142, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '250524', 'title': 'Amar Sonar Bangla', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 268, 'bleu_score': 0.788088265516915, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2352042927073248980}, 'section': 'Section::::Abstract.'}]}]