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
Smallest diameter of pelvis is? 
Select and explain. 
A. Interspinous diameter, B. True conjugate, C. Diagonal conjugate, D. Inteuberous diameter
A: Interspinous diameter
Answer: A: Interspinous diameter 
Explanation: Interspinous diameter REF: Clinical Obstetrics 10th edition by S. Gopalan, Sarala & Jain, Vanita Page 4, Manual of Obstetrics, 3e by Shirish N Daftary Page 11-12, Manual Of Obstetrics (2Nd Edition) by Daftary Page 16-18 "Interspinous diameter (transverse diameter of midpelvis = 10 cm or somewhat more) is the smallest diameter of pelvis" REF: Williams's obstetric 22nd edition page 34