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
Best time to do quadruple test 
Select and explain. 
A. 8-12 weeks, B. 11-15 weeks, C. 15-20 weeks, D. 18-22 weeks
C: 15-20 weeks
Answer: C: 15-20 weeks 
Explanation: * The quad screen is done in the second trimester, usually between 15 and 20 weeks of pregnancy. * Ideally, the test should be performed in conjunction with first-trimester screening tests. REF : DUTTA BOOK OF OBSTETRICS