This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Best time for detecting chorionicity twin pregnancy on USG Is: 
Select and explain. 
A. 8-12 weeks, B. 10-14 weeks, C. 14-18 weeks, D. 16-24 weeks
B: 10-14 weeks
Answer: B: 10-14 weeks 
Explanation: <p> Chorionicity of the placenta is best diagnosed by ultrasound at 10-13 weeks of gestation. Reference:DC Dutta&;s textbook of obstetrics,8th edition,page no;237 <\p>