The widest transverse diameter of the fetal skull is: (A) Biparietal diameter, (B) Occipito-frontal diameter, (C) Bitemporal diameter, (D) Suboccipito-frontal diameter
Answer is A. Transverse diameters of fetal skull are

Biparietal diameter: 9.5cm
Super-subparietal: 8.5cm
Bitemporal: 8cm
Bimastoid: 7.5cm