<prompt> Which is the smallest transverse diameter of fetal head:BiparietalBitemporalBimastoidSuper subparietal  <response>: Ans. c BimastoidRef: D.C. Dutta 8th ed. 94-97TRANVERSE DIAMETERS OF FETAL HEAD Biparietal: 9.5 cm Bitemporal: 8 cm Bimastoid: 7.5 cm; smallest transverse diameter Super subparietal: 8.5 cm 