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
Malformations of the following organ system of the fetus are found to be most commonly associated with single umbilical aery - 
Select and explain. 
A. Central nervous system, B. Cardiovascular, C. Genitourinary, D. Skeletal
C: Genitourinary
Answer: C: Genitourinary 
Explanation: Ans. is 'c' i.e., Genitourinary