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: Anatomy
[{'content': 'Which of the following is true regarding vessels in the umbilical cord : \nSelect and explain. \nA. Two aeries & two vein, B. One a & one vein, C. Two a & the left vein, D. Two a & the left vein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C. i.e. Two aeries and the left vein;', 'role': 'assistant'}]