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
A 24-year-old patient presents to OPD at 18 weeks of pregnancy with a previous history of a child with Down syndrome. The most appropriate is 
Select and explain. 
A. Triple test, B. Chorionic villous biopsy, C. Amniocentesis, D. Cordocentesis
C: Amniocentesis
Answer: C: Amniocentesis 
Explanation: "Tripple test gives risk ratio and for fuher confirmation amniocenteses has to be done" Tripple test (MSAFP, hCG, UE3) it is performed at 15-18 weeks while amniocenteses in performed at 16 weeks of pregnancy