This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Gynaecology & Obstetrics
Twin peak sign seen in 
Select and explain. 
A. Monochorionic Monoamniotic, B. Monochorionic Diamniotic, C. Dichorionic Diamniotic, D. Dichorionic Monoamniotic
C: Dichorionic Diamniotic
Answer: C: Dichorionic Diamniotic 
Explanation: Twin peak or lambda sign it is characterized of dichorionic pregnancies and is due to the chorionic tissue between the two layers of the intewin membrane at the placental origin . twin peak appears as a triangle with base at chorionic surface and apex in intewin membrane.