Question: when did sputnik 2 come back to earth
[{'answer': '14 April 1958', 'provenance': [{'wikipedia_id': '81978', 'title': 'Sputnik 2', 'start_paragraph_id': 30, 'start_character': 46, 'end_paragraph_id': 30, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::Reentry.\n'}]}, {'provenance': [{'wikipedia_id': '81978', 'title': 'Sputnik 2', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 432, 'bleu_score': 0.902196906227497, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2814442183892275120}, 'section': 'Section::::Reentry.\n'}]}]