Most common type of twin pregnancy is:: (A) Vertex + transverse, (B) Both vertex, (C) Vertex + breech, (D) Both breech
Answer is B. In twins most common lie of both the fetus at term is longitudinal.
Rarest lie is both the twins transverse.

Presentations

Both vertex (Most common) 60%
Vertex (Ist) – Breech (IInd) 20%
Breech (Ist) – Vertex (IInd) 10%
Both Breech 8-10%

Note: Interlocking of twins is a rare complication seen in twins with Ist Breech presentation and IInd vertex presentation.