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: Gynaecology & Obstetrics
Oxygenated blood from the placenta reaches the fetal heart in utero via: 
Select and explain. 
A. Umbilical arteries, B. Umbilical vein, C. Ductus venosus, D. Ductus arteriosus
C: Ductus venosus
Answer: C: Ductus venosus 
Explanation: None