question: Q:A 21-year-old primigravida woman visits the clinic in her 22nd week of gestation as part of her antenatal care. She has no complaints. Past medical history is unremarkable. Her only medication is a prenatal vitamin. Her temperature is 37.0°C (98.6°F), blood pressure is 110/70 mm Hg, pulse rate is 78/min, and respiration rate is 20/min. Physical examination is consistent with the gestational age of her pregnancy with no abnormalities noted. Urine dipstick is normal. Which of the following is the current primary location for fetal myelopoiesis at this stage of development?? 
  {'A': 'Yolk sac', 'B': 'Liver', 'C': 'Thymus', 'D': 'Aorta-gonad-mesonephros region', 'E': 'Spleen'},