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
Single umbilical aery is a/w an increased involvement of - 
Select and explain. 
A. Genitourinary system, B. CNS, C. Pulmonary system, D. Endocrine system
A: Genitourinary system
Answer: A: Genitourinary system 
Explanation: 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.