Question: where are white blood cells produced in the body
[{'answer': 'bone marrow', 'provenance': [{'wikipedia_id': '25164668', 'title': 'White blood cell', 'start_paragraph_id': 1, 'start_character': 288, 'end_paragraph_id': 1, 'end_character': 299, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25164668', 'title': 'White blood cell', 'start_paragraph_id': 1, 'start_character': 6, 'end_paragraph_id': 1, 'end_character': 417, 'bleu_score': 0.8945197557688881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14417579618496146936}, 'section': 'Section::::Abstract.'}]}]