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': 'The percentage of HbF at birth is: \nSelect and explain. \nA. 20%, B. 50%, C. 70%, D. 90%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c, i.e. 70%Ref NelsonDuring Intrauterine life HbF=90%At birth HbF=70%At 6 months after birth HbF=1-2%In Adults (HbF) is in traces.', 'role': 'assistant'}]