This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetal circulation, Subject name: Pediatrics
[{'content': 'Umbilical cord has: \nSelect and explain. \nA. 1 vein and 2 aeries, B. 2 vein and 2 aeries, C. 1 vein and 1 aery, D. 2 veins and 1 aery', 'role': 'user'}, {'content': "Answer: A \nExplanation: CONTENTS OF UMBILICAL CORD: - 2 Umbilical aeries - 1 Umbilical vein - Rudimentary allantois - Remnant of omphalomesenteric / vitellointestinal duct - Whaon's jelly", 'role': 'assistant'}]