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': 'One of the following features can be used to define contracted pelvis: \nSelect and explain. \nA. Transverse diameter of inlet is 10 cm, B. AP diameter of inlet is 12 cm, C. Platypelloid pelvis, D. Gynaecoid pelvis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Minimal/Critical diameters of the Pelvis: If any of the following diameter is less than critical diameter, Pelvis is said to be contracted', 'role': 'assistant'}]