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 is impossible in : 
Select and explain. 
A. Persistent Mento-posterior presentation, B. Persistent occipito-posterior presentation, C. Mento-anterior presentation, D. Breech presentation
A: Persistent Mento-posterior presentation
Answer: A: Persistent Mento-posterior presentation 
Explanation: Persistent Mento-posterior presentation