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
At 35years Maternal age-related risk for Down syndrome in singleton pregnancy at midtrimester is 
Select and explain. 
A. 1 in 31, B. 1 in 69, C. 1 in 149, D. 1 in 250
D: 1 in 250
Answer: D: 1 in 250 
Explanation: Maternal Age-Related Risk for Down Syndrome at Midtrimester in Singleton PregnanciesAgeMidtrimester351/250371/149401/69411/53421/41431/31441/25451/19(Ref: William's Obstetrics; 25th edition)