This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'In a fetus highest O2 concentration found in \nSelect and explain. \nA. svc, B. ivc, C. right ventricle, D. aoa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Highest o2 concentration umblical vien > ivc > svc> =ra=rv > umblical aery Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]