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
[{'content': 'In twin pregnancy, Vaginal delivery is contraindicated in \nSelect and explain. \nA. Monochorionic monoamniotic, B. First twin veex, 2nd breech, C. Second twin transverse, D. First twin Mentoanterior', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]