This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Vaginal delivery can be allowed in all of the following conditions, EXCEPT: 
Select and explain. 
A. Monochrionic, monoamniotic twins, B. Mentoanterior, C. Extended breech, D. Dichorionic twins with first veex & second breech
A: Monochrionic, monoamniotic twins
Answer: A: Monochrionic, monoamniotic twins 
Explanation: Mentoanterior face presentation, extended breech and dichorionic twins with first veex and second breech, all these can be allowed for vaginal delivery. The clinical indications for elective caesarean section in twin gestations includes a non veex first twin and monoamniotic twins. Complications of monochorionic monoamniotic twinning: Besides cord entanglement these twins are at greater risk of conjoining, preterm bih and twin-twin transfusion syndrome (TTTS).