This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Labour - II, Subject name: Gynaecology & Obstetrics
[{'content': 'What is normal bispinous diameter of pelvis \nSelect and explain. \nA. 11.5 cm, B. 12.5 cm, C. 9.5 cm, D. 10.5 cm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Normal Bispinous/Interspinous diameter - 10.5 cm', 'role': 'assistant'}]