This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetus Placenta & Fetal Membrane, Subject name: Gynaecology & Obstetrics
[{'content': 'Uteroplacental blood flow at term is: \nSelect and explain. \nA. 300-500 mL/min, B. 500-700 mL/min, C. 700-900 mL/min, D. 900-1100 mL/min', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b, i.e. 500-700 mL/minRef. Williams Obs. 25/e, p 132"Using ultrasound to study the uterine arteries, utero placental blood flow has been measured to increase progressively during pregnancy from approximately 450 mL/min in mid trimester to nearly 500-750 mL/min at 36 weeks"', 'role': 'assistant'}]