Twin peak sign seen in: (A) Monochorionic Monoamniotic, (B) Monochorionic Diamniotic, (C) Dichorionic Diamniotic, (D) Dichorionic Monoamniotic
Answer is C. 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.