Question: which substance increases the production of rbc’s
[{'answer': 'erythropoietin', 'provenance': [{'wikipedia_id': '682181', 'title': 'Erythropoiesis', 'start_paragraph_id': 2, 'start_character': 113, 'end_paragraph_id': 2, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '682181', 'title': 'Erythropoiesis', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 912, 'bleu_score': 0.8513803910184481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8347812563098000498}, 'section': 'Section::::Abstract.'}]}]