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: Gynaecology & Obstetrics
Screening for Down's syndrome should be done in the age group - in pregnancy : 
Select and explain. 
A. 30, B. 35, C. All in the reproductive age group, D. None
B: 35
Answer: B: 35 
Explanation: 35