This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'In ductus venous, the fetal blood from the placenta reaches to the liver through \nSelect and explain. \nA. Poal vein, B. Right umbilical vein, C. Inferior vena cava, D. Left umbilical vein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: when there is an increase in placental circulation, to facilitate the rapid transpo of blood through the liver ,a large passage is formed between left umbilical vein and right hepato cardiac channel.This passage is called ductus venosus REFERENCE: TEXTBOOK OF CLINICAL EMBRYOLOGY... VISHRAM SINGH SECOND EDITION....PAGE NO:241', 'role': 'assistant'}]