This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'Cesarean section is mandatory in following presentation \nSelect and explain. \nA. Cephalic, B. Veex, C. Face, D. Brow', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In brow presentation, the engaging diameter is Mentoveical diameter which is 14 cms that cannot pass through cervix Hence,cesarean section is mandatory. Ref: Datta Obs 9e pg 368.', 'role': 'assistant'}]