<prompt> Smallest diameter of p elvis is?Interspinous diameterTrue conjugateDiagonal conjugateIntertuberous diameter  <response>: ANSWER: A Interspinous diameterREF: 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 16-18Interspinous diameter transverse diameter of midpelvis 10 cm or somewhat more is the smallest diameter of pelvis REF: Williamss obstetric 22nd edition page 34Measurements of Pelvis AnterioposteriorObliqueTransverseInletTrue conjugate11 cm12 cm13 cmObstetric conjugate10.5 cmDiagonal conjugate12 cmMid pelvisPlane of greatest dimension12 cm12 cm12 cmPlane of least dimension10 cm10 cm10 cminterspinousOutlet13 cm12 cm11 cmShortest anteroposterior diameter of inlet of pelvis is obstetrical conjugateInterspinous diameter, 10 cm or somewhat more, is usually the smallest diameter of the pelvisPelvic inlet is an adequate size for a normal fetus if the diagonal conjugate is 12 cm or greater 