This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gestational Diabetes Mellitus, Subject name: Gynaecology & Obstetrics
[{'content': 'What is TRUE with the findings of a single umbilical aery on examination of the umbilical cord \nSelect and explain. \nA. Insignificant, B. Equal in incidence in all races, C. No incidence of any association with major malformation of the fetus, D. More common in newborns of diabetic mothers', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The incidence of a single aery is significantly increased in newborns of diabetic mothers, and it occurs in white infants twice as often as in newborns of black women. The incidence of major fetal malformations when only one aery is identified has been repoed to be as high as 18%, and there is an increased incidence of overall fetal moality.', 'role': 'assistant'}]