<prompt> Most important diameter of pelvis during labour is:Interspinous diameter of outletOblique diameter of inletAP diameter of outletIntertubercular diameter  <response>: Ans. is a, i.e. Interspinous diameter of the outletRef. Williams Obs. 24e, p 33; Dutta Obs. 9e, p 82Interspinous diameter is the distance between the two ischial spines and is the smallest diameter of the pelvis 10 cm or slightly greater. It corresponds to the transverse diameter of midpelvis i.e. plane of least pelvis dimensions. 