This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pediatrics
[{'content': 'Fetal erythropoeis is first occurs at what week of gestation ? \nSelect and explain. \nA. 6, B. 10, C. 12, D. 14', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hematopoiesis stars in yolksac at 14 days of gestation. by 6 to 10 weeks erythropoesis occurs in liver. Textbook of obstetrics by sheipa balakrishnan,second edition, p.no:67', 'role': 'assistant'}]