This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Twin Pregnancy, Molar Pregnancy, Gestational Trophoblastic disease and contraception in special situations (Sour Grapes!), Subject name: Gynaecology & Obstetrics
In twin pregnancy, Vaginal delivery is contraindicated in 
Select and explain. 
A. Monochorionic monoamniotic, B. First twin veex, 2nd breech, C. Second twin transverse, D. First twin Mentoanterior
A: Monochorionic monoamniotic
Answer: A: Monochorionic monoamniotic 
Explanation: Monoamniotic twins are at a great risk of developing cord accidents like entanglement which can lead to sudden fetal death. Therefore all monoamniotic twins have to be delivered by a Cesarean sections between 32-34 weeks , after ensuring lung maturation