This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetal Skull and Maternal Pelvis, Subject name: Gynaecology & Obstetrics
[{'content': 'Shortest diameter of female pelvic inlet is: \nSelect and explain. \nA. Obstetric conjugate, B. Diagonal conjugate, C. True conjugate, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Obstetric conjugate) Ref: Dutta, 6th ed,p. 88Obstetric conjugate is the shortest antero-posterior diameter of female pelvic inlet. Diagonal conjugate (DC)True conjugate(Anatomical)Obstetric conjugateDistance: from mid point of sacral promontory to...Lower border of symphysis pubisUpper border of symphisis pubisMidline projection of Symphisis pubisMeasureMeasured by12 cmPelvimetry11 cmDC--1 cm10 cmDC-1.5 cm', 'role': 'assistant'}]