Question: where does red blood cell formation occur in adults
[{'answer': 'bone marrow', 'provenance': [{'wikipedia_id': '67158', 'title': 'Red blood cell', 'start_paragraph_id': 3, 'start_character': 361, 'end_paragraph_id': 3, 'end_character': 372, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '67158', 'title': 'Red blood cell', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 670, 'bleu_score': 0.9522287480520011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18165363620800246448}, 'section': 'Section::::Abstract.'}]}]