Longest fetal diameter:
Ans is d, i.e. MentoverticalFetal diameters-AP diameters are always longer than Transverse diameter of fetal head.Longest diameter is-Mentovertical diameter (14 cms) followed by submentovertical diameter.
Biparietal
Suboccip tobregmatic
Occipitofrontal
Mentovertical
Fetal Skull and Maternal Pelvis