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: Anaesthesia
[{'content': 'A 20 year old G1P0 female at 40 weeks of gestation presents to labor room with rupture of membranes and early onset of labor. She is extremely anxious with peripheral i.v placement and begins to Hyperventilate. If allowed to continue hyperventilation, It will cause \nSelect and explain. \nA. Decreased maternal arterial pH, B. Increased placental perfusion, C. Increased fetal arterial pH, D. Decreased maternal uterine artery flow', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hyperventilation\xa0→ CO2\xa0washout\xa0→Low PaCO2\xa0levels\xa0→ Vasoconstriction\xa0→ Reduced placental perfusion', 'role': 'assistant'}]