This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in obstetrics, Subject name: Gynaecology & Obstetrics
The best time to do chorionic villous sampling is: 
Select and explain. 
A. Between 6-8 weeks, B. Between 7-9 weeks, C. Between 9-11 weeks, D. Between 11-13 weeks
D: Between 11-13 weeks
Answer: D: Between 11-13 weeks 
Explanation: Chorionic villus sampling prenatal diagnosis of genetic disorders transcervical done:at 10-12 weeks transabdominal done from 10 weeks to term diagnosis can be obtained by 24 hours complications like fetal loss,oromandibular limb deformities,vaginal bleeding are higher D.C.DUTTA'S TEXTBOOK OF OBSTETRICS,Pg no:107,7th edition