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
[{'content': 'In face presentation, outlet forceps delivery can be accomplished successfully in all of the following positions except : \nSelect and explain. \nA. Right mento-anterior, B. Persistent mento-posterior, C. Direct anterior, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans:B.)Persistent mento-posterior', 'role': 'assistant'}]