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': 'Forceps delivery is indicated in all of the following conditions, except \nSelect and explain. \nA. Face presentation, B. Occipitoposterior, C. After warming head in breech, D. Brow presentation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In brow presentation, the engaging diameter of head is mentoveical (14cm) . In this case vaginal delivery is impossible and elective caesarean section is usually performed.', 'role': 'assistant'}]