<prompt> Most common type of twin pregnancy is:Vertex transverseBoth vertexVertex breechBoth breech  <response>: In twins most common lie of both the fetus at term is longitudinal.Rarest lie is both the twins transverse.PresentationsBoth vertex Most common 60Vertex Ist Breech IInd 20Breech Ist Vertex IInd 10Both Breech 8-10Note: Interlocking of twins is a rare complication seen in twins with Ist Breech presentation and IInd vertex presentation. 