This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
The finding of a single umbilical aery on ultrasound is : 
Select and explain. 
A. Insignificant, B. Occurs in 10% of newborns, C. An Indicator of considerably increased incidence of major malformations in the fetus, D. Equally common in newborn of diabetic and nondiabetic mothers
C: An Indicator of considerably increased incidence of major malformations in the fetus
Answer: C: An Indicator of considerably increased incidence of major malformations in the fetus 
Explanation: The presence of a single umbilical aery may be associated with congenital malformations.Reference: Textbook of obstetrics, Sheila Balakrishnan, 2nd edition, page no:63