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: Pediatrics
[{'content': 'Malformations of the following organ system of the fetus are found to be most commonly associated with single umbilical aery - \nSelect and explain. \nA. Central nervous system, B. Cardiovascular, C. Genitourinary, D. Skeletal', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Genitourinary", 'role': 'assistant'}]