This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: congenital anomalies of kidney, Subject name: Pediatrics
[{'content': 'Single umbilical aery is a/w an increased involvement of - \nSelect and explain. \nA. Genitourinary system, B. CNS, C. Pulmonary system, D. Endocrine system', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Single umbilical aery is a/w an increased risk for an occult renal anomaly. Cardiovascular system involvement is the next. Also know - Single umbilical aery is the most common umbilical anomaly.', 'role': 'assistant'}]