This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Labour - III, Subject name: Gynaecology & Obstetrics
[{'content': 'The engaging diameter in brow presentation is? \nSelect and explain. \nA. Mentoveical, B. Submentoveical, C. Suboccipitofrontal, D. Suboccipitobregmatic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The engaging diameter of Brow presentation is mentoveical - 14 cm', 'role': 'assistant'}]