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': 'Maximum diameter of pelvic inlet is : \nSelect and explain. \nA. Transverse diameter, B. Diagonal conjugate, C. Obstetric conjugate, D. True conjugate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Transverse diameter', 'role': 'assistant'}]