Question: in the alpha decay of francium-221 what daughter element is produced
[{'answer': 'astatine - 217'}, {'provenance': [{'wikipedia_id': '10821', 'title': 'Francium', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 219, 'bleu_score': 0.6741753257823091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17593452634835132507}, 'section': 'Section::::Isotopes.\n'}]}]