Multiple choice Which one of the following pregnancies carries the highest risk of adverse outcome? Singleton pregnancy Dichorionic diamniotic twins Monochorionic diamniotic twins Monochorionic monoamniotic twins Disappearing twin Reveal answer Fill a bubble to check yourself D Correct answer Explanation Pregnancies that share the placenta and amnion are at highest risk of adverse outcome because of risk of twin-to-twin transfusion syndrome and cord entanglement.