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': 'Transverse diameter of the female mid-pelvic plane is: March 2011 \nSelect and explain. \nA. 9.5, B. 10.5, C. 11.5, D. 12.5', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: 10.5 Transverse diameter of the mid-pelvis/ bispinous (10.5): It measures between the 2 ischial spines Diameters: Shoest diameter of pelvic inlet: Obstetrical conjugate 2nd Shoest diameter of fetal skull: Bitemporal 2nd Largest diameter of fetal skull: Submentoveical', 'role': 'assistant'}]