This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
[{'content': 'The umbilical venous pO2 is _________ \nSelect and explain. \nA. 20-25 mmHg, B. 25-48 mmHg, C. 30-32 mmHg, D. 40-45 mmHg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Umbilical venous PO2 is approximately 28 mm Hg. Two compensatory mechanisms, namely the high oxygen affinity and the high oxygen capacity of fetal blood, produce an umbilical venous oxygen content, which is comparable to normal values of adult aerial blood. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]