This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood: RBCs, Anemia, and Polycythemia, Subject name: Physiology
[{'content': 'Erythopoiesis in gestation age takes place in - \nSelect and explain. \nA. Yolk sac, B. Placenta, C. Amniotic sac, D. Chorion', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Yolk sac Erythropoiesis siteso Intrauterine* 0-10 weeks-Yolk sac* 10 weeks - 5 months-Liver (major organ) and spleen* 5 month onwrard-Bone marrowo After birth* Upto 20 years-Bone marrow of all bones* After 20 years-Flat bones of axial skeletal and proximal end of humerus and femur.", 'role': 'assistant'}]