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': 'The widest transverse diameter of the fetal skull is \nSelect and explain. \nA. Biparietal diameter, B. Occipito-frontal diameter, C. Bitemporal diameter, D. Suboccipito-frontal diameter', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Transverse diameters of fetal skull are\n\nBiparietal diameter: 9.5cm\nSuper-subparietal: 8.5cm\nBitemporal: 8cm\nBimastoid: 7.5cm', 'role': 'assistant'}]