This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
Advantages of ultrasound nuchal translucency over biochemical screening for Down syndrome include 
Select and explain. 
A. Uses transvaginal approach, B. More consistent measurements than lab tests, C. Better in multiple gestation, D. Wide gestational age range
C: Better in multiple gestation
Answer: C: Better in multiple gestation 
Explanation: Biochemistry does not work well for multiple gestations.