Question: what is the normal range for rdw-sd blood test
[{'answer': '11.5 - 14.5 % .', 'provenance': [{'wikipedia_id': '593422', 'title': 'Red blood cell distribution width', 'start_paragraph_id': 1, 'start_character': 460, 'end_paragraph_id': 1, 'end_character': 474, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '593422', 'title': 'Red blood cell distribution width', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 720, 'bleu_score': 0.9845548242372031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5807450351873721630}, 'section': 'Section::::Abstract.'}]}]