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': 'Shoest diameter of true pelvis amongst the following is: September 2008 \nSelect and explain. \nA. True conjugate, B. Diagonal conjugate, C. Interspinous diameter, D. Inteuberous diameter', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Interspinous Diameter True conjugate-between the midpoint of the sacral promontory to the inner margin of the upper border of symphysis pubis-11 cm Diagonal conjugate-between the lower border of symphysis pubis to the midpoint on the sacral promontory-12 cm Interspinous (Bispinous) diameter-between the tip of two ischial spines-10.5 cm lnteuberous diameter-between inner borders of ischial tuberosities-11 cm', 'role': 'assistant'}]