<prompt> Shortest sacrocotyloid diameter causing narrowing of pelvis is a feature of which type of maternal pelvis?AndroidGynaecoidPlatypelloidAnthrapoid  <response>: Ans. c Platypelloid Ref. Dutta Obstetrics 6th ed., p 90SACROCOTYLOID DIAMETER 9.5 cm It is the distance between the mid point of the sacral promontory to iliopubic eminence. It represents the space occupied by the biparietal dimeter of the head while negotiating the brim of flat pelvis. Flat pelvis transversely ovalI Platypelloid pelvis is characterized by shortest sacrocotyloid diameter causing narrowing of pelvis from side to side. 