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
True about Dizygotic twins 
Select and explain. 
A. Always same sex, B. Always different sex, C. Separate chorion and amnion, D. Blood group is always different
C: Separate chorion and amnion
Answer: C: Separate chorion and amnion 
Explanation: Dizygotic twins : There are two placentae, either completely separated or more commonly fused Fetus surrounded by a separate amnion and chorion Ref: Dutta Obs 9e pg 189.