This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Red bone marrow is involved in erythropoiesis from \nSelect and explain. \nA. 3 week to 3 months intra uterine, B. 3 months to 5 months Intrauterine, C. >5 months IU, D. > 5 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Erythropoiesis:\nIntra uterine Life:\n\n3 wk to 3 month —> Yolk sac\n3 month to 5 month —> Liver + spleen\n> 5 Month —> Red bone marrow\n\n\xa0\nBirth to 20 yrs —> Flat + long bones\n\xa0\n> 20 yrs — Flat bone', 'role': 'assistant'}]